Gadsden Purchase in the United States is a region of 29,670-square-mile of what we know today as southern Arizona and southwestern New Mexico purchased from Mexico by the United States in a the Gasden treaty signed by US President Franklin Pierce and the Mexican ruler Antonio López de Santa Anna.
The purchase purpose was to building a transcontinental railroad along the southern route of the United States.
It also solved the pending border problems after the Treaty of Guadalupe-Hidalgo that ended the Mexican-American war
