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ON THIS DAY FEBRUARY 2, 1848 The Treaty of Guadalupe Hidalgo (gwah-dah-loop-ayee-dahl-go), which brought an official end to the Mexican-American War (1846-1848) was signed on February 2, 1848, at Guadalupe Hidalgo, a city north of the capital where the Mexican government had fled with the advance of U.S. forces. The Treaty of Guadalupe Hidalgo ended the U.S.-Mexican War. Signed on 2 February 1848, it is the oldest treaty still in force between the United States and Mexico. As a result of the treaty, the United States acquired more than 500,000 square miles of valuable territory and emerged as a world power in the late nineteenth century.