The correct answer is An invasion of Japan would cost too many American lives.
On August 6 and 9, 1945, the United States used atomic bombs for the first time in human history. They were launched over the Japanese cities of Hiroshima and Nagasaki. The purpose of this act was to force Japan to surrender and prevent a likely invasion of that country, which would result in thousands of allied soldiers killed.
With the Japanese refusal to surrender, the Americans chose to use the atomic bomb in the Japanese city of Hiroshima. The attack took place on August 6, 1945 and was carried out by a B-29 bomber named Enola Gay. The plane was piloted by Paul Tibbets, who chose the Aioi bridge as the central target.
The bomb exploded at about 580 meters in height and gave rise to a small sun, which spread a flash across the city and a wave of energy and heat that was responsible for the almost complete material destruction of the city of Hiroshima, in addition to resulting in 80,000 victims. immediate.