
What makes a president great —
John F. Kennedy signs the nuclear test ban treaty before senators, Vice President Lyndon B. Johnson, right, and Secretary of State Dean Rusk, second from left, foreground. Take a look at what other presidents have done to secure their legacy.

What makes a president great —
Ronald Reagan helped force the collapse of the Soviet Union and the end of the Cold War.

What makes a president great —
Franklin D. Roosevelt declares an "unlimited" national state of emergency in a radio broadcast on May 27, 1941, in response to German aggression during World War II.

What makes a president great —
Harry S. Truman stands between Sir Winston Churchill, right, and Soviet leader Joseph Stalin at a meeting in Potsdam, Germany, in 1946 after World War II ended.

What makes a president great —
Theodore Roosevelt, left, poses with the conservationist John Muir on Glacier Point in Yosemite, California. Roosevelt was the first president to extensively preserve national forests and parks.

What makes a president great —
Abraham Lincoln meets with Gen. George McClellan, sixth from left, and his Union troops at Sharpsburg, Maryland, following the Battle of Antietam on October 3, 1862.

What makes a president great —
Andrew Jackson established the principle that ordinary people should exercise political power.

What makes a president great —
Thomas Jefferson doubled the size of the United States with the Louisiana Purchase in 1803.

What makes a president great —
George Washington created a nation out of a confederation of states.


