It's impossible to know for certain what would have happened if Stalin hadn't called off the planned landing on Hokkaido. 

It's possible that the Soviet Union would have entered the war against Japan, leading to a quicker end to the conflict. However, it's also possible that this could have escalated the already tense relations between the United States and the Soviet Union and potentially even led to a wider conflict between the two superpowers.

Additionally, if the Soviet Union had occupied a large part of Japan post-war, it's likely that this would have had significant implications for the balance of power in East Asia and the post-war world order. It's possible that this could have led to a prolonged period of tension and instability in the region.

In hindsight though, it's clear that Truman's decision to use the atomic bomb played a significant role in bringing the war to a swift end and shaping the post-war world order.
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