Treaty of Guadalupe Hidalgo 1848
The treaty provided for the Mexican Cession, in which Mexico ceded 1.36 million km² (525,000 square miles) (55%[3] of its pre-war territory) to the United States in exchange for US$15 million (equivalent to $313 million in 2006 dollars) and the ensured safety of pre-existing property rights of Mexican citizens in the transferred territories, the latter of which the United States in a significant number of cases failed to honor.
http://en.wikipedia.org/wiki/Treaty_of_G...
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