Georgia is a southern state of the United States and its U.S. postal abbreviation is GA. Georgia was one of the thirteen colonies that revolted against British rule in the American Revolution. It was the thirteenth colony and became the fourth state, ratifying the United States Constitution on January 2, 1788. Georgia's population in 2000 was 8,186,453 (U.S. Census). Georgia is one of the fastest growing states in the nation, with an estimated 8,829,383 people in 2004. Georgia is also known as the Peach State or Empire State of the South.