Why did President Truman decide to use the atomic bomb. Main Idea and Details

Main Idea: Truman wanted to end WW2 quickly after Germany and Italy surrendered. (Japan did not)

Details:

They did not want to have a full scale invasion of Japan as fatalities would be high. Nor have a full scale blockade of Japan as that would take too long.

The U. S. S. R was also trying to make a move on Japan, and the U. S did not want the U. S. S. R to have influence over a beaten Japan.

The U. S actually had no idea what the Atomic Bombs would do to cities, as they only tested it in a desert. So Truman decided it was no different from bombings of Dresden/Tokyo

Truman believed that the bombs saved Japanese lives as well