Definition: Given a text passage, come up with an appropriate title for it. The title should accurately represent what the main focus of the passage is. The title of a passage may be present in the first few sentences of the passage and/or be referred to multiple times in the passage. The title should be 1-5 words long.
Input: The Mexican Cession of 1848 is a historical name in the United States for the region of the modern day southwestern United States that Mexico ceded to the U.S. in the Treaty of Guadalupe Hidalgo in 1848 . It had not been part of the areas east of the Rio Grande which had been claimed by the Republic of Texas , though the Texas annexation resolution two years earlier had not specified the southern and western boundary of Texas . The Mexican Cession ( 529,000 sq. miles ) was the third largest acquisition of territory in US history . The largest was the Louisiana Purchase , with some 827,000 sq. miles , followed by the acquisition of Alaska ( about 586,000 sq. miles ) .
Output:
Mexican Cession