Which President served as a lieutenant colonel in the Spanish-American war? Who was the first Democrat elected after the Civil War? Who introduced Social Security? If you're looking to learn more about the past Presidents who have led our country, you're in the right place. Take a look at our full set of biographies. Then, quiz your friends. Learn More About Each President
18th Century
1. George Washington 19th Century
3. Thomas Jefferson 20th Century
26. Theodore Roosevelt 21st Century
43. George W. Bush
There have been 46 presidents of the United States. The youngest president was John F. Kennedy at age 43. The oldest is Joe Biden at age 78. The longest-serving president was Franklin D. Roosevelt, who died shortly into his fourth term in office. (The 22nd Amendment, ratified in 1951, limited to two the number of presidential terms one person could serve.) The shortest serving president was William Henry Harrison, who died from pneumonia after a month in office. List of u.s. Presidents in order
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