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During most of the Late Cretaceous (100.5 to 66 million years ago) the eastern half of North America formed Appalachia (named for the Appalachian Mountains), an island land mass separated from Laramidia to the west by the Western Interior Seaway. This seaway had split North America into two massive landmasses due to a multitude of factors such ...
The northern end of the Appalachian Basin extends offshore into Lakes Erie and Ontario as far as the United States–Canada border. The province covers an area of about 185,500 square miles (480,000 km 2 ) and is 1,075 miles (1,730 km) long from northeast to southwest and between 20 and 310 miles (30 and 500 km) wide from northwest to southeast.
The Appalachian Mountains, [b] often called the Appalachians, are a mountain range in eastern to northeastern North America.The term "Appalachian" refers to several different regions associated with the mountain range, and its surrounding terrain.
The Appalachian Regional Commission (ARC) was created by the U.S. Congress in 1965 to bring poor areas of the 13 U.S. states of the main (southern) range of the Appalachians into the mainstream of the American economy. The commission is a partnership of federal, state, and local governments, and was created to promote economic growth and ...
In the United States, the Hillbilly Highway is the out-migration of Appalachians from the Appalachian Highlands region to industrial cities in northern, midwestern, and western states, primarily in the years following World War II in search of better-paying industrial jobs and higher standards of living.
The Alleghanian orogeny, a result of three separate continental collisions. USGS. The immense region involved in the continental collision, the vast temporal length of the orogeny, and the thickness of the pile of sediments and igneous rocks known to have been involved are evidence that at the peak of the mountain-building process, the Appalachians likely once reached elevations similar to ...
The move further alienates Anglo-American settlers in Mexican Texas. [52] Dec 10: The two-month Siege of Béxar culminates in the surrender of the last remaining Mexican garrison in Texas, under Martín Perfecto de Cos, to the Texian Army under Edward Burleson. Santa Anna immediately prepares to march overland to recapture San Antonio. [53 ...
While many sources state that Mexico recognized the independence of the eastern portion of Texas, the treaties were rejected by the Mexican government. Texas formally handed over sovereignty to the United States in a ceremony on February 19, 1846. [180] The annexation led to the beginning of the Mexican–American War a few months later. [180 ...