dec 29, 1853 - Gadsden Purchase
Description:
It was the Gadsden Purchase that settled the main boundaries of the United States of America (though Alaska was added in 1867). The Louisiana Purchase of fifty years earlier, the biggest land sale in history, had transferred an area of 827,000 square miles between the Mississippi and the Rocky Mountains from theoretical French sovereignty to the United StatesAdded to timeline:
Date:
dec 29, 1853
Now
~ 172 years ago