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 C.I.A. official, pleaded guilty to passing U.S. secrets to the U.S.S.R. 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 U.S. Federal Bureau of Investigation. Also read a CNN interview with Ames.