Treaty of Guadalupe Hidalgo, the peace treaty between the US and Mexico that ended the Mexican War, was signed Feb 2, 1848. - See more at: http://www.chacha.com/question/what-was-signed-by-mexico%27s-leader-on-february-2,-1848%3F-br0t-herkeeper%3F-what-was-signed-by-mexico%27s-leader-on-february-2,-1848%3F-br0t-herkeeper#sthash.4gmPeVZ9.dpuf
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The acquisition of New Mexico and California is called the Mexican Cession of 1848. The Mexican Cession also included California, Nevada, and Utah.
i belive it is, total : 74,019,951
Now considered foreigners
The Mexican War 1846-1848, was under the banner of "Manifest Destiny."
the United states paid Mexico $15 million dollars for this land, which became known as the mexican cession