Milestones in the History of U.S. Foreign Relations

Gadsden Purchase, 1853–1854

The Gadsden Purchase, or Treaty, was an agreement between the United States and Mexico, finalized in 1854, in which the United States agreed to pay Mexico $10 million for a 29,670 square mile portion of Mexico that later became part of Arizonaand New Mexico. Gadsden’s… Read More ›

Monroe Doctrine, 1823

In his December 2, 1823, address to Congress, President James Monroe articulated United States’ policy on the new political order developing in the rest of the Americas and the role of Europe in the Western Hemisphere. The statement, known as the Monroe… Read More ›