Which country used the atomic bomb during World War II?

• A. United States
• B. United Kingdom
• C. Soviet Union
• D. Germany

Answer: (A)

The main idea is that atomic bombs were used in World War II only by the United States. The United States built the bomb through the Manhattan Project and dropped two of them on Japanese targets in August 1945—Hiroshima and Nagasaki. This display of nuclear power, along with other war pressures, helped Japan decide to surrender, bringing World War II to a close. Other nations did pursue nuclear research, but they did not deploy atomic bombs in the war: the United Kingdom contributed to the effort and shared findings with the United States; the Soviet Union started its own program and would test a bomb after the war in 1949; Germany pursued a program but never produced an operational weapon before the war ended. So, the United States is the country that used an atomic bomb during World War II.