Some presidents of the United States, such as George Washington, John Adams, Thomas Jefferson, James Madison and James Monroe, are very well known. Others, such as John Quincy Adams, made contributions that tend to be overlooked in histories of the presidency.
Andrew Jackson was the seventh president, and he was succeeded by Martin Van Buren. The remaining presidents who served prior to the outbreak of the Civil War were: William Henry Harrison, John Tyler, James K. Polk, Zachary Taylor and Millard Fillmore, with Franklin Pierce and James Buchanan presiding during the 1850s. Abraham Lincoln led the nation during four years of war and successfully concluded the secession crisis. He was also the first president to be assassinated.
Lincoln's vice-president, Andrew Johnson, was the first president to be impeached, though he was not removed from office, and his term was followed by that of Civil War general Ulysses Grant. Rutherford B. Hayes won office by a single vote in the Electoral College and was succeeded by James Garfield. The remaining presidents of the 19th century were: Chester A. Arthur, Grover Cleveland, Benjamin Harrison, Grover Cleveland (again) and William McKinley, who was assassinated early in his second term.
Theodore Roosevelt became president after McKinley's death, to be followed by William Taft, Woodrow Wilson, Warren Harding, Calvin Coolidge and Herbert Hoover. As the Great Depression worsened, Franklin Roosevelt was elected to the first of four terms. He was succeeded by Harry Truman, Dwight Eisenhower, John Kennedy and Lyndon Johnson, in turn.
Richard Nixon was the only president to resign, and Gerald Ford, having been appointed vice-president, then became president. James Carter followed and was defeated in 1980 by Ronald Reagan. George Bush, Bill Clinton and George W. Bush followed. The 44th president, Barack Obama, was elected in 2008 and re-elected in 2009.