The Mexican Frontier, 1821–1846 translated into Spanish and published in Mexico and Spain. As of 2013, it was still in print. The book won the Ray Allen Billington Prize from the Organization of American Historians in 1983, the Westerners International Co-Founders Book Award for best nonfiction of 1982, the 1982 history Award from the Border Regional Library Association, and the Presidio La Bahia Award from the Sons of the Texas Republic. The Mexican Frontier, 1821–1846 The Mexican Frontier, 1821–1846: The American Southwest Under Mexico by historian David J. Weber is a history of the part of Mexico's north and northwest that became part of
Mexican–American War could not be released from its obligations. The US was released from all obligations of Article XI five years later by Article II of the Gadsden Purchase of 1853. The 1848 Treaty of Guadalupe Hidalgo ended the war and enforced the Mexican Cession of the northern territories of Alta California and Santa Fe de Nuevo México to the United States. Mexico acknowledged the loss of what became the State of Texas and accepted the Rio Grande as its northern border with the U.S. The losses amounted to one-third of its original territory from its 1821 independence. Before the secession of