The correct answer is:
Mexican citizens.
The Gadsden Purchase is a region the United States purchased from Mexico by the Treaty of Mesilla (1854). The acquisition incorporated lands that the U.S. wanted to develop a transcontinental railroad along a southern route.
The Gadsden Purchase was the least important territorial acquisition in the United States and settled the Mexico–United States border.
Santa Anna´s government was under financial distress and may have decide to cede territory by treaty and obtain payment instead of having the territory just seized by the U.S.
