Andrew Jackson Jr. (March 15, 1767 – June 8, 1845) was an American politician who was the seventh president of the United States from 1829 to 1837. He was the first president to be a Democrat and is on the twenty dollar bill. His nickname was "Old Hickory". He forced many Native Americans to leave their homeland so white people could live there, and many died and contracted diseases. This was called the Trail of Tears. He was also the first president to ride in a train.