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Population of pennsylvania state
Pennsylvania, officially Commonwealth of Pennsylvania, constituent state of the United States of America, one of the original 13 American colonies. The state is approximately rectangular in shape and stretches about 300 miles (480 km) from east to west and 150 miles (240 km) from north to south. It is bounded to the north by Lake Erie and New York state; to the east by New York and New Jersey; to the south by Delaware, Maryland, and West Virginia; and to the west by the panhandle of West Virginia and by Ohio. Harrisburg, nestled in the foothills of the Appalachian Mountains, is the capital.
Pennsylvania is classified as a Middle Atlantic state, along with New York, New Jersey, Delaware, and Maryland. Its central location on the Eastern Seaboard is sometimes said to be the source of its nickname, the Keystone State. It does not, however, touch the Atlantic Ocean at any point. Water nonetheless has been nearly as crucial in the state’s growth as the wealth of its earth. The Delaware River forms the boundary between Pennsylvania and New Jersey. In the northwest a small panhandle separates Ohio and New York and forms a 40-mile (65-km) waterfront on Lake Erie, giving the state access to the iron ore barges and other commerce of the Great Lakes.
The state has two great metropolitan areas. Philadelphia is a part of the East Coast population belt stretching from Boston to Norfolk, Virginia. It is a major harbour on the Delaware River and one of the world’s busiest shipping centres. In the west, Pittsburgh lies on the eastern edge of the great industrial region extending along the Great Lakes plains to Chicago. Area 46,054 square miles (119,280 square km). Population (2010) 12,702,379; (2018 est.) 12,807,060.
The landforms of Pennsylvania had their origin about 500 million years ago, when a vast interior sea, up to several hundred miles wide, occupied the area from New England to Alabama. For about 250 million years, the rivers originating from an extensive mountain chain on the east poured sediments into the great Appalachian downwarp basin. Great swamps prevailed in southwestern Pennsylvania for millions of years and provided the vegetation that ultimately became the coal beds of the area.
Beginning about 250 million years ago, plate-tectonic movement folded the flat-lying sediment into upwarps and downwarps. The heat created by this pressure also metamorphosed the rocks, changing the sandstone into quartzite, limestone into marble, and granite into gneiss. The pressure from the plate movement was confined to southeastern Pennsylvania, creating the Piedmont and Ridge and Valley provinces. The rocks of the Appalachian Plateau remained essentially flat-lying, and the dissection of the plateau has been created by erosion.
Pennsylvania includes parts of large physiographic regions that extend beyond its borders; those regions crossing the eastern and central parts of the state parallel one another along a sweeping northeast-southwest diagonal orientation. In the southeastern part of the state is a section of the Atlantic Coastal Plain, a narrow strip of sandy low-lying land immediately adjacent to the Delaware River. This region has played a major role in Pennsylvania history. It was the site of William Penn’s settlement and the initial city of Philadelphia. Immediately inland from the Coastal Plain is the Piedmont province, a gently rolling, well-drained plain that is rarely more than 500 feet (150 metres) above sea level; the eastern part is the Piedmont Upland. The boundary between the Piedmont and the Coastal Plain is known as the fall line, with hard rock to the west and soft rock to the east. The Piedmont Lowland parallels the Piedmont Upland to its northwest. It is made of sedimentary rocks into which volcanic rocks have been intruded. Some of these volcanic rocks make ridges. The Battle of Gettysburg was fought there, the Northern army on the high ridges having the advantage over the Southern forces on the plains. The limestone rocks have weathered into fertile lowlands such as the Conestoga Lowlands of Lancaster county. Farther to the northwest lie two segments of a larger mountain range. The southern prong, extending to the Carlisle area, is the northernmost extension of the Blue Ridge system. The northern portion, known as the Reading Prong, is a small section of the larger New England topographic region. There is a major gap between these prongs.
Inland from the Blue Ridge is one of the country’s most distinctive topographic regions, the Ridge and Valley Province. It consists of long, narrow valleys and parallel ridges aligned over a long distance. As seen from space, it appears as if an enormous rake had been dragged along the backbone of the Appalachians from northeast to southwest. None of the ridges rises above the valley floor more than 1,000 feet (300 metres), and nowhere does the elevation reach 3,000 feet (900 metres). On the east is the Great Valley, which stretches more than 1,200 miles (1,930 km) from Pennsylvania to Alabama. To the west and north of the Ridge and Valley Province is the Appalachian Plateau, an area of nearly 30,000 square miles (77,700 square km). The Allegheny Front, more than 1,500 feet (450 metres) high, divides the two provinces. With no passes, it is the most formidable obstacle to east-west transportation in Pennsylvania. Almost everywhere the plateau surface has been dissected by rivers into a chaos of valleys and hills. Mount Davis is the highest point in the state at 3,213 feet (979 metres). However, elevations range from about 1,000 to 3,000 feet. On the northwest is the narrow Lake Erie Plain, which rises in a series of steps from the lakeshore to the high escarpment of the Appalachian Plateau.
Pennsylvania has three major river systems. In the east is the Delaware River, fed mainly by the Lehigh and Schuylkill rivers. In the central part of the state is the Susquehanna, draining the largest section of the state; it is a wide, shallow stream that meanders finally into Maryland and Chesapeake Bay. In the west is the Ohio River—formed by the confluence of the Allegheny (north) and Monongahela (south) rivers at Pittsburgh—from where it flows westward to the Mississippi River. Minor systems lead into Lake Erie in the northwest and the Potomac River from the southwest.
Pennsylvania generally has a humid continental climate characterized by wide fluctuations in seasonal temperatures, with prevailing winds from the west. The average temperature in July is about 70 °F (21 °C) and in January about 28 °F (−2 °C). The growing season varies from nearly 200 days in the southeast to only 90 days in the north-central part of the state. On average, about 40 inches (1,000 mm) of precipitation fall in the state annually. The daily weather is influenced by the passage of cyclone fronts in the westerly wind system.
Plant and animal life
At the time of the first European settlement in 1682, the land surface of Pennsylvania was covered entirely by trees. By about 1900 some three-fourths of the land had been cleared of forests, principally for farmland. Since then, vast areas of farmland have been abandoned, and much of that land has returned to forest cover. About half of the state is now wooded, although only small areas are still virgin forest. Pennsylvania occupies a transition zone between the northern and southern forests of the United States. In the north are beech, maple, birch, pine, and hemlock trees, while in the south oak, hickory, yellow poplar, walnut, and elm dominate.
Pennsylvania’s abundant wildlife makes it a leading state for hunting. Not only is there abundant small game—rabbits, pheasants, and squirrels—but tens of thousands of deer and a few hundred black bears are killed by hunters every year. The streams are stocked with fish—trout, walleye, and others—each spring to support sportfishing.
Scattered groups of Native Americans, small in number, lived in the Pennsylvania area at the time of European settlement. With the disappearance of the last recognizable Native American groups by the mid-19th century, Native Americans have become an inconspicuous part of the state’s population, numbering only some 15,000 in the early 21st century.
Because of the state’s rugged topography, settlement in Pennsylvania proceeded slowly. From Philadelphia, people moved west and north. However, it took about 80 years for settlement to extend west to the Ridge and Valley area of central Pennsylvania. In the western part of the state, the first settlers arrived from Virginia, traveling west by way of the Potomac River and north along the Monongahela River, reaching Pittsburgh in the 1750s. In 1840 settlers reached the last remaining unexploited area—the rugged north-central portion of the state. Thus, it took 160 years from the first settlement for the final pioneer area to be occupied.
There were a few Swedish, Dutch, and Finnish settlers in Pennsylvania prior to William Penn’s arrival. Initially, English Quakers (adherents of the Society of Friends) were the most important group to occupy the Delaware valley. Philadelphia, along with nearby Chester and Bucks counties, became the first thriving agricultural commercial region.
Penn’s practice of religious toleration and his experiments with democratic forms of government encouraged other groups to settle in Pennsylvania. Germans were the first major group to immigrate to Pennsylvania. Almost entirely Protestant, they belonged to a wide array of denominations, from mainstream Lutheranism and Calvinism to various pietistic groups, including the Amish, Mennonites, Moravians, Schwenkfelders, and Dunkers. By the time of the American Revolution, the German groups (by then known as Pennsylvania Dutch, or, more correctly, Pennsylvania Germans), constituted one-third of the population.
The next major group to settle in Pennsylvania comprised Scotch-Irish from Northern Ireland. To find farmland they moved westward beyond the English and the Germans to the western Piedmont and the Ridge and Valley region. By the time of the Revolution, they constituted one-fourth of the total population of the colony. The fourth major group, the Irish, emigrated from their homeland in the 1840s and ’50s because of the Irish Potato Famine.
The Industrial Revolution spurred the development of a dynamic economy in Pennsylvania. Because the domestic population was inadequate to supply the needed labour, the state became the centre of a massive migration of Italians, Poles, Russians, Ukrainians, and people from the Balkan region, among others. Between 1890 and 1900 the population of the state rose to more than a million, largely because of immigration to the mining areas and new industrial centres. In the 20th century, African Americans began to move into the state from the South; they now constitute about one-tenth of the state’s total population. Asians, Hispanics, and Native Americans collectively constitute only a small fraction of the population.
The population of Pennsylvania has been nearly stable since reaching 10.5 million in 1950, having increased by only a few million in subsequent decades. Through the late 20th and early 21st centuries, the state’s annual population growth was less than 1 percent.
The economy of Pennsylvania has evolved through three distinct eras since the time of the first settlement. From 1682 to about 1830 a rural agricultural economy dominated. From the 1830s to about 1920 Pennsylvania developed one of the world’s great industrial economies, based on the production of iron and steel, machinery, fabricated metals, leather, textiles, and apparel. Since the 1920s service activities have increased drastically and have come to dominate employment. Of the total workforce, only a tiny fraction is now employed in the primary sector (agriculture, mining, and lumbering). About one-fifth is employed in manufacturing and construction, and the remaining workers are in the service sector.
Pennsylvania agriculture has been in a continuous state of change since the founding of the colony. The changes have been gradual and evolutionary, but three distinct periods are recognizable. The pioneer era, during which the land was cleared, lasted from 1682 to the 1830s. Subsistence farming predominated during that time, in which the farm provided food for the family and a small surplus that could be sold to the local community. The second period (c. 1830 to the 1920s) was dominated by general agriculture, in which farmers produced food to supply an expanding urban economy. Most agricultural machinery was invented during that period, which made it possible to farm more land and increase production of all kinds of products. However, by the 1920s the cost of agricultural production in Pennsylvania was higher than in any other state in the country, and Pennsylvania agriculture entered a third stage, in which farmers began to focus on more specialized products. Over time, most of the poor farmland was abandoned.
Pennsylvania has one of the largest rural populations in the United States, and nearly one-third of the state is still under cultivation. Livestock—including dairy and beef cattle, hogs, and sheep—and livestock products are the major components of farm income. Pennsylvania is a major producer of milk, eggs, and poultry; fruits, including peaches, grapes, cherries, and apples; hay; corn (maize); mushrooms; and Christmas trees. Ice cream and sausages are important processed food products.
Resources and power
Hydrocarbons—bituminous (soft) coal, anthracite (hard coal), petroleum, and natural gas—provide a vast majority of the mineral wealth of the state. Pennsylvania has also been a major producer of such nonmetallic minerals as limestone, slate, sand, and gravel. Small iron ore deposits provided the basis of early iron furnaces, but the major deposits of iron ore that were located in Cornwall and Morgantown have since been abandoned.
Bituminous coal beds are located in portions of 33 Pennsylvania counties and constitute more than one-fourth of the state’s total area. Maximum production was reached in 1918, when nearly 200 million tons of coal were mined. Since the late 20th century, production has fallen to roughly one-fourth of that annually, owing to competition from petroleum and natural gas as well as the existence now of environmental laws that limit the consumption of sulfur-containing coal. Pennsylvania has the only significant deposits of anthracite in the country. Production peaked in 1917, when more than 100 million tons were mined; however, production has also declined—even more precipitously than it has for bituminous—because of competition from other available energy sources.
Northwestern Pennsylvania was the site of the world’s first successful oil well (1859, near Titusville) and its first oil boom, in the 1860s. The state’s oil fields are now nearly exhausted, but natural gas production remains significant, and Pennsylvania still has one of the largest oil-refining capacities of any state on the East Coast.
Although coal production is only a fraction of previous levels, coal-fired thermal plants still generate most of the state’s electric power, with natural gas and oil also used in considerably lesser amounts. The most serious nuclear accident in the history of American nuclear-power industry occurred at the Three Mile Island plant, near Harrisburg, in 1979. However, nuclear energy still provides about one-third of the state’s power generated. Hydroelectric stations and other power sources constitute only a tiny portion of the total.
During Pennsylvania’s industrial heyday in the 19th and 20th centuries, the Philadelphia and Pittsburgh regions were its primary centres. Eastern Pennsylvania was noted for lighter manufacturing such as textiles, apparel, metal fabrication, and chemicals. The western part of the state focused on heavy manufacturing such as iron, steel, and machinery.
Employment in industry reached its peak of some 1.5 million in about 1970; however, that number had decreased sharply by the late 1990s. The traditional industries of textiles, apparel, iron and steel, tobacco, and leather products declined rapidly. By the early 21st century the most important industries were those producing fabricated metals, machinery, lumber, and instruments, as well as printing and publishing. Although overall employment in manufacturing had declined, the value of manufactured products continued to make a significant contribution to the state’s revenue. In the southeastern counties of Chester, Bucks, Berks, Montgomery, Lancaster, and York, high-technology industries have grown in importance.
Since the mid-20th century the service sector has been a steadily increasing source of employment in Pennsylvania. In 1940 nearly half of the state’s labour force was in service jobs, and by the turn of the 21st century that proportion had increased to more than three-fourths of the workforce. The growth in service employment originally came from workers who had been active in mining and agriculture and, later, in manufacturing. Tourism is a significant source of jobs and revenue to the state and is one of the fastest-growing areas of the economy.
The number of people working in finance, insurance, and real estate grew rapidly during the 20th century, particularly in the banking and insurance fields. Real estate, security and commodity brokerages, non-depository credit institutions, and holding and investment offices were other significant employers. In the early 21st century, business services such as advertising, credit reports, and public relations were among the most rapidly growing services in the state.
Since the colonial period, when waterways and trails provided the earliest means of travel, modes of transportation have evolved to serve the changing economy. The first major effort to improve transportation came with the building of a network of improved but unpaved roads in Pennsylvania. The extension of the Old Conestoga Road from Philadelphia to Lancaster was begun in 1721 and completed in 1733. Later that century the Lancaster Turnpike was built, roughly following the Conestoga Road; it was the country’s first turnpike. This road-building era was followed by the canal era, which dominated transportation from about 1830 to the 1850s. Canals were superseded by railroads as the primary mode of transportation until the early 20th century.
The modern period of transportation began with the widespread use of motor vehicles. As highways were built and improved, the importance of railroads declined. Today, the only interstate passenger rail service still in operation is Amtrak, which operates routes connecting Philadelphia and Pittsburgh to Washington, D.C., and linking Philadelphia with Harrisburg and cities along the Eastern Seaboard; another line travels along Pennsylvania’s Lake Erie shore on a route between Chicago and points east. SEPTA (Southeastern Pennsylvania Transportation Authority) provides regional passenger rail service around the greater Philadelphia area and extending to points in New Jersey in addition to its city bus, subway, and trolley services.
In the 20th century, Pennsylvania’s highway system was created in three stages: the establishment of the state road system, the creation of east-west and north-south U.S. highways (aided by federal funds), and the development of the interstate system. The state’s highway system, one of the most extensive in the country, includes the Pennsylvania Turnpike, a four-lane limited-access toll road (built 1939–40) joining New Jersey and Ohio; it became a model for modern superhighway construction. The turnpike is paralleled to the north by Interstate 80, known in Pennsylvania as the Keystone Shortway.
Pennsylvania has more than 100,000 miles (160,000 km) of highways; the state has primary responsibility for some two-fifths of the mileage. The remainder of its roads are controlled by counties, townships, boroughs, and cities.
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