Identify the cities most affected by American action in World War II.

Hiroshima, Nagasaki

Reason — During World War II, the United States dropped atomic bombs on the Japanese cities of Hiroshima (on August 6, 1945) and Nagasaki (on August 9, 1945). These two bombings were the most significant American military actions in terms of civilian impact and destruction, ultimately leading to Japan’s surrender and the end of World War II.