Final answer:
The Treaty of Guadalupe Hidalgo, signed in 1848, officially ended the Mexican-American War by ceding large territories to the U.S. and confirming the U.S. title to Texas.
Step-by-step explanation:
The Treaty of Guadalupe Hidalgo, signed in February 1848, officially ended the Mexican-American War.
By this treaty, Mexico ceded a vast area of land, totaling approximately 525,000 square miles, to the United States, which included territory that would become all or parts of California, Arizona, New Mexico, Texas, Utah, Nevada, Colorado, Wyoming, and Kansas.
In addition to confirming the U.S. title to Texas, the United States agreed to pay Mexico $15 million and to assume American claims against the Mexican government, which amounted to about $3,250,000.