The American Revolution was achieved by the original 13 states the eastern seaboard. The Treaty of 1783, which ended the war with Britain, gave another huge area of land, further the west, to the new country, to over the next fifty years the whole of the American mainland was brought under US control. Some of this land was acquired by treaty such as Florida; some by purchase, such as Louisiana (the Mid-West) which was sold to the US by Napoleon in 1803; and some by war, such as Texas and California, which were ceded by Mexico in the war of 1845 47.