He didn't. He was advised on that respect by scientist from around the world during world war two meaning he found out after being elected President.
princess patrick harwood President Truman
Harry Truman
President Truman
Harry Truman
Atomic Bombs
President Truman gave the order to drop an atomic bomb on Japan during World War II. He was the first and only U.S. President to order the use of an atomic bomb as a military weapon.
He became president in 1945.
Harry Truman
President Harry Truman
Harry S. Truman
President Harry Truman.
That was President Truman's call.