Treaty of Guadalupe Hidalgo
The Treaty of Guadalupe Hidalgo (Tratado de Guadalupe Hidalgo in Spanish
Spanish language
Spanish , also known as Castilian , is a Romance language in the Ibero-Romance group that evolved from several languages and dialects in central-northern Iberia around the 9th century and gradually spread with the expansion of the Kingdom of Castile into central and southern Iberia during the...

) is the peace treaty
Peace treaty
A peace treaty is an agreement between two or more hostile parties, usually countries or governments, that formally ends a state of war between the parties...

, largely dictated by the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 to the interim
Ad interim
The Latin phrase ad interim literally means "in the time between" denotes the meaning of "in the meantime", "for an intervening time" or "temporarily" in the English language...

 government of a militarily occupied
Military occupation
Military occupation occurs when the control and authority over a territory passes to a hostile army. The territory then becomes occupied territory.-Military occupation and the laws of war:...

 Mexico City
Mexico City
Mexico City is the Federal District , capital of Mexico and seat of the federal powers of the Mexican Union. It is a federal entity within Mexico which is not part of any one of the 31 Mexican states but belongs to the federation as a whole...

, that ended the Mexican-American War (1846 – 48) on February 2, 1848. With the defeat of its army and the fall of the capital, Mexico
The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...

 surrendered to the United States and entered into negotiations to end the war.
The peace talks were negotiated by Nicholas Trist
Nicholas Trist
Nicholas Philip Trist was an American diplomat.Trist was born in Charlottesville, Virginia. He attended West Point and studied law under Thomas Jefferson, whose granddaughter he married. He was also private secretary to Andrew Jackson.Through political connections, Trist was appointed U.S...

, chief clerk of the State Department, who had accompanied General Winfield Scott as a diplomat and President Polk's representative.