What are the terms of the Gadsden purchase?

He was James Gadsden, the American Ambassador to Mexico.

U.S. purchase of land in southern New Mexico and Arizona south of the Gila River on December 30, 1853. It was purchased to get approval for a southern railroad route to the Pacific Coast in that...

Mexico sold parts of southern Arizona and New Mexico to the United States.

The Gadsden purchase was in 1853.

It is when the US bought the land on the southern tips of New Mexico and Arizona from Spain, right after the Mexican War in the year 1853. It was bought for railroads.