When China was invaded by Japan, why did the United States drop two atomic bombs on Hiroshima and Nagasaki on August 6th and 9th? 1945?

In order to end the war at an early date and reduce American casualties.

Prior to this, the Allies issued an announcement demanding that Japan surrender, but the Japanese claimed that 100 million people would die and launch a decisive battle at home. The U.S. War Department estimated that if the U.S. troops landed in Japan and wiped out the Japanese army completely, they might have to pay 6.5438+100,000 casualties, because only in Ryukyu and Iwo Jima, the Japanese army fought to the death and the American troops suffered huge casualties. Therefore, the United States decided to scare Japan with nuclear weapons and force Japan to surrender with the great lethality of atomic bombs. As a result, the Japanese were really scared. After all, this thing is destroyed city by city, and there are not so many cities in Japan for him to bomb.

As for Hiroshima and Nagasaki, it is a pity that these two places have moderate population, suitable location and no American prisoners of war, so they were chosen.