Definition of Gadsden Treaty

What does the word Gadsden Treaty mean?

• part of speech: noun

  was a treaty negotiated with Mexico in 1853 by James Gadsden. By this treaty the United States secured 45,000 square miles of laud in what is now Arizona and New Mexico. The United States paid Mexico $10,000,000, but received a considerably larger amount from Mexico for Indian depredation claims.