While the U.N. debated strategies for control of atomic energy, the U.S. Navy was preparing for nuclear tests on Bikini Island, forcing residents to move away for more than 40 years.
Major Walter Reed's discovery in 1900 that mosquitoes spread yellow fever halted an outbreak and led to the disease's eventual eradication.
During the Great Depression, Americans built the Hoover Dam, one of the greatest engineering works in history.
Robert E. Lee, the leading Confederate general of the American Civil War, remains a source of fascination and, for some, veneration.
The internationally famous carnival of delights in New York was the birthplace of the hot dog and the roller coaster.
A brilliant scientist, Oppenheimer was tasked with the development of the atomic bomb during World War II.
Engineer James Eads tamed the mighty Mississippi, turning New Orleans into the second largest port in the nation.
In the Philippines, Army Rangers liberated 513 prisoners of war three years after the Bataan Death March.
General Douglas MacArthur led American troops in World Wars I and II before being fired by President Harry Truman during the Korean War.