What effect did the dropping of the atomic bomb have after the war?

a. It made future wars less likely.

b. It started the Vietnam War.

c. It ended relations between Japan and the Allies.

d. It started a nuclear arms race.

The United States becomes the first and only nation to use atomic weaponry during wartime when it drops anatomic bomb on the Japanese city of Hiroshima. Though the dropping of the atomic bomb on Japan marked the end of World War II, many historians argue that it also ignited the Cold War.