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The United States grew from 13 colonies in 1776 to a nation of 48 states by 1912. The new territories were acquired through a series of purchases and treaties: France sold a vast area with the Louisiana Purchase
the British ceded the territories of the Northwest with the Oregon Treaty. Some regions — including Texas — were annexed, while much of the West was conquered in the war against Mexico (1846-1848) or became the subject of subsequent sales by the Mexican regime, eager for money
