Obscure Date Marks Mexican-American Origins

01/28/2013 09:01 am ET

Few will notice that Saturday is a significant day in U.S. history.

Feb. 2 won't ring a bell for anyone except perhaps historians and Chicano activists, who'll know el segundo de Febrero commemorates the biggest boundary dispute in the nation's history.

Better known as the Treaty of Guadalupe Hidalgo, it not only ended the Mexican American War but extended U.S. boundaries to Colorado and Utah and all the way west to the Pacific, setting the southern border at the Rio Grande.

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