In which war did the atomic bombings of Hiroshima and Nagasaki occur?

The story behind the answer

World War II is correct because the United States dropped atomic bombs on Hiroshima (August 6, 1945) and Nagasaki (August 9, 1945) to force Japan’s surrender, ending the war in the Pacific. These were the first and only wartime uses of nuclear weapons, developed under the top-secret Manhattan Project.

Context: The blasts—“Little Boy” and “Fat Man”—killed tens of thousands instantly and many more from radiation, prompting Japan’s surrender on August 15 (V-J Day) and formal capitulation on September 2, 1945. Remember it this way: World War II had “two” in its name and ended with two atomic bombs in 1945. Earlier wars like World War I, the First Sino-Japanese War, and the Russo-Japanese War occurred before nuclear technology existed.