Allied forces captured the final island nation of Iwo Jima. At the time the atom bomb was dropped to try to end the war ( it did not end the war), there were millions of troops within about 2 weeks from invading Japan. If this had happened, millions of Japanese civilians would have been killed - they would have fought the Allies to the death. Hundreds of thousands of Allied soldiers also would have been killed. fortunately, the dropping of the hydrogen bomb on Nagasaki caused the Japanese Army to give up. ( Most of the Japanese Navy had been wanting peace for at least a year, at that point.)
The capture of the island of Okinawa in the summer of 1945 provided the U.S. with a large place to begin the staging of an invasion into Japan.
See "The Planned Invasion of Japan: Bibliography of works by D. M. Giangreco" at http://www.waszak.com/giangreco_bibliography.htm .
it would prevent high casualties that would be caused by an invasion of mainland japan
It became clear that an invasion of Japan would be extremely costly.
the beginning of WW2 in Asia and Europe.
Okinawa
The capture of the island of Okinawa in the summer of 1945 provided the U.S. with a large place to begin the staging of an invasion into Japan.
No, in fact they were preparing for an invasion of mainland Japan.
During the early part of World War Two, the distance of Japan was so far from the US that the Pacific Ocean protected Japan from invasion. The Chinese had no chance to invade Japan and the USSR had an agreement not to engage in combat until the very last days before Japan's surrender.
The last battle of WWII was the Battle for Okinawa. "IF" the two A-bombs had not been dropped on Japan, invasions into Japan would've been launched from the captured island of Okinawa.
Before Japan became an island, it was connected to the Asian mainland by a land bridge during the last ice age about 11,000 years ago. This land bridge allowed for the migration of flora, fauna, and humans between Japan and mainland Asia.
It was to be a launching pad for the final invasion on Japan.
Part of the Asian Mainland
Japan had invaded China and was trying to conquer it. It had also occupied French Indochina as way to cut off western supplies to China & prepare for an invasion of the Dutch East Indies & British territories in southern Asia. Japan was also preparing to invade the Philippines, Guam & Wake Island.
Asia, specifically japan began a full scale invasion of china on July 7, 1937; shortly before WWII is considered to have started.
He wanted to avoid an invasion of Japan.
1945, just in time to use 2 to end the war before the invasion of Japan was scheduled to start.