West coast of America
The West coast of America—commonly referred to as the American West or simply The West—
traditionally refers to the region comprising the westernmost states of the United States. Since the
United States has expanded westward since it is founding, the definition of the West has evolved over
time. The Mississippi River is often referenced as the easternmost possible boundary of the West.
The region encompasses some of the Louisiana Purchase, most of the land ceded by Britain in 1818,
some of the land acquired when the Republic of Texas joined the United States, all of the land ceded by
Britain in 1846, all of the land ceded by Mexico in 1848, and all of the Gadsden Purchase.
Geography
In its most expansive definition, the western United States is the largest region, covering more than half
the nation's land area. It is also the most geographically diverse, incorporating regions such as the Pacific
Coast, the temperate rainforests of the Northwest, the Rocky Mountains, the Great Plains, most of the
tall-grass prairie eastward to Illinois, the western Ozark plateau, the western portions of the southern
forests, the Gulf Coast, and all of the desert areas located in the United States (the Mojave, Sonoran,
Great Basin, and Chihuahua deserts).
Variation and regionalism
As the largest region in the United States there is variation to such an extent that the West is often
broken down into regions. Arizona, Colorado, California, New Mexico, Nevada, Oklahoma, Texas, and
Utah or sections of those states are sometimes considered the Southwest, while all or part of Idaho,
Montana, Oregon, Washington, and Wyoming can be considered the Northwest; more narrowly, part or
all of those same states, with the exception of Wyoming and the eastern portions of Montana and Idaho
and the addition of the Canadian province of British Columbia, comprise the Pacific Northwest.
The term West Coast is usually restricted to California, Oregon, and Washington. The Mountain States
include Arizona, Colorado, Idaho, Montana, Nevada, New Mexico, Utah, and Wyoming. Alaska and
Hawaii, being detached from the other western states, have few similarities with them but are usually
also classified as part of the West.
Some western states are grouped into regions with eastern states. Kansas, Nebraska, South Dakota, and
North Dakota are often included in the Midwest, which also includes states like Iowa, Illinois, and
Wisconsin. Texas and Oklahoma are often considered part of the Southwest, and Texas and Louisiana
are also considered part of the South.