the eastern and western boudaries of Patagonia is ''fagtopolis''.
The Atlantic Ocean defines the United States' eastern border.
not generally since 1803 & not a bit since 1818
the border was the lousiana teritory
The US state of Montana has an eastern border with North Dakota and South Dakota.
The Mississippi River formed the eastern border of the Louisiana Territory, which was acquired by the United States from France in 1803.
There are no countries that border the US on the east. The eastern US is bordered by the Atlantic Ocean. and their northern Border has Canada all the way to the Canadian north pole.
200 miles
I not 100% but I think it is Spain.
Russia does not share an eastern border with anyone, but it is on the coast of the Bering Sea and just across that is the US state of Alaska.
North Dakota and South Dakota border Minnesota to the east.
Canada touches the entire northern border of the 48 contiguous United States, and the whole eastern border of Alaska.