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In OTL Japan surrendered just after the 2nd Atom bomb and the USSR declared war. (Ed Murrow suggested at the time that it was not clear which event caused the surrender.
However
1) WI the bombs were available a month earlier.
2) WI Japan had not surrendered despite both the bombs and the Soviet Union.
3) WI Japan had surrendered conditionally some time before August.
4) WI the bomb had not been available until say September.