Beginning with George Washington, who was the first president of the United States, other past presidents include Thomas Jefferson, Grover Cleveland, Calvin Coolidge, Ronald Reagan and Bill Clinton. Many past presidents of the United States worked to institute change long after holding office.
The office of president of the United States began in the 18th century with George Washington's presidency. After serving as vice president to George Washington, John Adams became the only other president of that particular century. There were 23 presidents in the 19th century, including James Monroe, Andrew Jackson, Martin Van Buren, James K. Polk, and Franklin Pierce. Abraham Lincoln, Ulysses S. Grant and William McKinley were others.
Theodore Roosevelt, Woodrow Wilson, Herbert Hoover, Franklin D. Roosevelt and John F. Kennedy are just a handful of the 17 presidents who served in the 20th century. Lyndon B. Johnson, Richard Nixon, James Carter and George H. W. Bush are others. The presidents of the 21st century started with George W. Bush.
Several past presidents served more than one term in office, some consecutively, some non-consecutively and others when a vice president took office after the death of a president. With the passage of the 22nd Amendment of the U.S. Constitution, presidents are only eligible to serve for two terms in office, whether consecutive or non-consecutive. The only exception to this is in the event a vice president has to take office. In this case, he can run for two consecutive elected terms after fulfilling the appointed position.