On April 28, 1952, a peace treaty between Japan and 48 nations took effect, formally ending World War II.

Review the terms of the San Francisco Treaty.

On April 28, 1994, Aldrich Ames, a former CIA official, pleaded guilty to passing US secrets to the USSR during the Cold War. Ames further confessed that he continued spying for Russia after the collapse of the Soviet Union. Learn more about the case of Aldrich Ames from the FBI. Also read a CNN interview with Ames.