This is a simple definition of his philosophy called Dualism.
The President has the power to sign or veto legislation, command the armed forces, ask for the written opinion of their Cabinet, convene or adjourn Congress, grant reprieves and pardons, and receive ambassadors from other countries.
All of them are correct except the first one
Well, it can't be the Cuban missile crisis, that was before he was president, he was the vicepresident.
the bombing of Japan happened about 20 years earlier.
He did sign the Civil Rights act into Federal Law, and that was very significant.