The single greatest and most significant event ever to take place in American History. Covered extensively in APUSH, it was the purchase of what is now Southwestern New Mexico and Southern Arizona from Mexico. It was officially ratified in 1854. The treaty was negotiated by James Gadsden, who wanted to build a transcontinental railroad through the area. This railroad was never actually built, but the territory acquired through the Gadsden Purchase remains undoubtedly one of the most critical additions to the United States.
"You've got to be able to laugh at the Gadsden Purchase, it's what life's all about!"
"Who's your favorite president?"
"Franklin Pierce, obviously, because he ratified the Gadsden Purchase."
"It's June 8th, why are you having a party?"
"To celebrate the final approval and ratification of the Gadsden Purchase, of course!"