150th Anniv. Of Guadalupe-Hidalgo NPR's Neal Conan examines the Treaty of Guadalupe-Hidalgo, which ended the war between the United States and Mexico. The treaty made it possible for the U-S to purchase approximately half of Mexico's territory for 15 million dollars. The land that was acquired covers more than a million square miles...and today is covered by the states of California, Arizona, New Mexico, and portions of Utah, Nevada, Colorado and Texas. Today is the 150th anniversary of Senate ratification of the treaty.