The area in United States west of the

Appalachian Mountains The Appalachian Mountains, often called the Appalachians, (french: Appalaches), are a system of mountains in eastern to northeastern North America. The Appalachians first formed roughly 480 million years ago during the Ordovician Period. The ...

and extending vaguely to the

Mississippi River The Mississippi River is the List of longest rivers of the United States (by main stem), second-longest river and chief river of the second-largest Drainage system (geomorphology), drainage system in North America, second only to the Hudson B ...

, spanning the lower Great Lakes to the upper south, is a region known as trans-Appalachia, particularly when referring to frontier times. It included much of Ohio Country and at least the northern and eastern parts of the

Old Southwest Old or OLD may refer to: Places * Old, Baranya, Hungary * Old, Northamptonshire, England *Old Street station, a railway and tube station in London (station code OLD) *OLD, IATA code for Old Town Municipal Airport and Seaplane Base, Old Town, M ...

. It was never an organized territory or other political unit. Most of what was referred to by this name became the states of western

Pennsylvania Pennsylvania (; ( Pennsylvania Dutch: )), officially the Commonwealth of Pennsylvania, is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States. It borders Delaware to its southeast, ...

Ohio Ohio () is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. Of the List of states and territories of the United States, fifty U.S. states, it is the List of U.S. states and territories by area, 34th-l ...

West Virginia West Virginia is a state in the Appalachian, Mid-Atlantic and Southeastern regions of the United States.The Census Bureau and the Association of American Geographers classify West Virginia as part of the Southern United States while the ...

Kentucky Kentucky ( , ), officially the Commonwealth of Kentucky, is a state in the Southeastern region of the United States and one of the states of the Upper South. It borders Illinois, Indiana, and Ohio to the north; West Virginia and Virginia ...

Tennessee Tennessee ( , ), officially the State of Tennessee, is a landlocked U.S. state, state in the Southeastern United States, Southeastern region of the United States. Tennessee is the List of U.S. states and territories by area, 36th-largest by ...

and western

Virginia Virginia, officially the Commonwealth of Virginia, is a state in the Mid-Atlantic and Southeastern regions of the United States, between the Atlantic Coast and the Appalachian Mountains. The geography and climate of the Commonwealth are ...

. It is still a vague and little used place name today. A similar name, trans-Allegheny, has much the same usage (usually as an adjective) and refers to the

Allegheny Mountains The Allegheny Mountain Range (; also spelled Alleghany or Allegany), informally the Alleghenies, is part of the vast Appalachian Mountain Range of the Eastern United States and Canada and posed a significant barrier to land travel in less devel ...

, the northern portion of the Appalachians.

First US inhabitants of the trans-Appalachia region

Starting in the mid-18th century, Americans who wanted to find a better life in the wilderness traveled several main roads over the Appalachians. Those from

New England New England is a region comprising six states in the Northeastern United States: Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and Vermont. It is bordered by the state of New York to the west and by the Canadian provinces ...

followed the

Mohawk Trail The Mohawk Trail began as a Native American trade route which connected Atlantic tribes with tribes in Upstate New York and beyond. It followed the Millers River, Deerfield River and crossed the Hoosac Range, in the area that is now northwestern ...

into western

New York New York most commonly refers to: * New York City, the most populous city in the United States, located in the state of New York * New York (state), a state in the northeastern United States New York may also refer to: Film and television * '' ...

. The travelers from

Philadelphia Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Since ...

took Forbes' Road to

Pittsburgh Pittsburgh ( ) is a city in the Commonwealth (U.S. state), Commonwealth of Pennsylvania, United States, and the county seat of Allegheny County, Pennsylvania, Allegheny County. It is the most populous city in both Allegheny County and Wester ...

, where they could travel west on the

Ohio River The Ohio River is a long river in the United States. It is located at the boundary of the Midwestern and Southern United States, flowing southwesterly from western Pennsylvania to its mouth on the Mississippi River at the southern tip of ...

. From

Baltimore Baltimore ( , locally: or ) is the most populous city in the U.S. state of Maryland, fourth most populous city in the Mid-Atlantic, and the 30th most populous city in the United States with a population of 585,708 in 2020. Baltimore was ...

, they went to Pittsburgh on

Braddock's Road The Braddock Road was a military road built in 1755 in what was then British America and is now the United States. It was the first improved road to cross the barrier of the successive ridgelines of the Appalachian Mountains. It was constructe ...

. Middle Atlantic settlers used Cumberland Road (the National Road). Southerners used either the Great Valley Road or the Richmond Road through the mountains to the

Cumberland Gap The Cumberland Gap is a pass through the long ridge of the Cumberland Mountains, within the Appalachian Mountains, near the junction of the U.S. states of Kentucky, Virginia, and Tennessee. It is famous in American colonial history for its r ...

. From there they could take the

Wilderness Road The Wilderness Road was one of two principal routes used by colonial and early national era settlers to reach Kentucky from the East. Although this road goes through the Cumberland Gap into southern Kentucky and northern Tennessee, the other (m ...

northward into present day

and the

Ohio Valley The Ohio River is a long river in the United States. It is located at the boundary of the Midwestern and Southern United States, flowing southwesterly from western Pennsylvania to its mouth on the Mississippi River at the southern tip of Illin ...

Daniel Boone Daniel Boone (September 26, 1820) was an American pioneer and frontiersman whose exploits made him one of the first folk heroes of the United States. He became famous for his exploration and settlement of Kentucky, which was then beyond the we ...

was hired by the

Transylvania Company The Transylvania Colony, also referred to as the Transylvania Purchase, was a short-lived, extra-legal colony founded in early 1775 by North Carolina land speculator Richard Henderson, who formed and controlled the Transylvania Company. Henders ...

to cut the Wilderness Road.

Increasing trans-Appalachian populations

Between 1790 and 1810, around 98,000 slaves, along with their owners, moved west into the region south of the

(the

Northwest Ordinance The Northwest Ordinance (formally An Ordinance for the Government of the Territory of the United States, North-West of the River Ohio and also known as the Ordinance of 1787), enacted July 13, 1787, was an organic act of the Congress of the Co ...

of 1787 had forbidden slavery in states north of the Ohio). * By 1795, in

, 75,000 * By 1830, hundreds of thousands of settlers were in the region, which at that time consisted of

Michigan Territory The Territory of Michigan was an organized incorporated territory of the United States that existed from June 30, 1805, until January 26, 1837, when the final extent of the territory was admitted to the Union as the State of Michigan. Detroit ...

, and the new states of **

, with 1,000,000 inhabitants, **

Indiana Indiana () is a U.S. state in the Midwestern United States. It is the 38th-largest by area and the 17th-most populous of the 50 States. Its capital and largest city is Indianapolis. Indiana was admitted to the United States as the 19th ...

, with almost 350,000 inhabitants, and **

Illinois Illinois ( ) is a state in the Midwestern United States. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. Other smaller metropolitan areas include, Peoria and Rock ...

, with more than 150,000 inhabitants.

First US inhabitants of the trans-Appalachia region

Increasing trans-Appalachian populations

See also