Original: It was established by Executive Order 10924 on March 1, 1961, and authorized by the Congress on September 22, 1961, with passage of the Peace Corps Act (Public Law 87-293).
Simplified: The Peace Corps was started by Executive Order 10924 on March 1, 1961, and allowed by Congress on September 22, 1961, with passage of the Peace Corps Act (Public Law 87-293).