Question 21 • DRHS GA-GSE US History A
The Gadsden Purchase added a strip of land in what is now southern Arizona and New Mexico, helping complete the contiguous continental expansion of the United States. The United States paid Mexico $10 million for the territory, which was sought in part as a suitable route for a southern railroad. It did not acquire the much larger Mexican Cession; that came from the Treaty of Guadalupe Hidalgo.
AI-written and checked against the verified answer.