What forms the western border of the United States?
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The Missouri River and its tributary, the Big Sioux, form the western border, making Iowa the only U.S. state that has two parallel rivers defining its borders.
People also ask, what was the western border of the US in 1783?
Mississippi River
Thereof, what was the western border of the US?
The fledgling nation stretched from the sparsely settled Atlantic Coast in the east, to the Mississippi River in the west; from the Great Lakes in the north, to near the Gulf of Mexico in the south.
There are eighteen: thirteen on the US-Canada border and four on the US-Mexico border and one has maritime borders with Cuba and The Bahamas. US States bordering Canada (east to west): Maine. New Hampshire.