How were the actions of the victorious Allies in the after World War II different from those following previous wars?

From this perspective, the Allies won because their benign, more-integrated societies allowed them to totally mobilize for war, while the conservative, even reactionary attitudes of the Nazis and the Japanese ensured that they lost. ... In World War II, the Allies outfought the Axis on land, in the air, and at sea.

Allies wanted unconditional surrender so they advanced west while soviet played offense in the east. hitler went into hiding and committed sucide while the US launched an atomic bomb on japan ending the war.

After the war, the Allies rescinded Japanese pre-war annexations such as Manchuria, and Korea became militarily occupied by the United States in the south and by the Soviet Union in the north. The Philippines and Guam were returned to the United States. ... Okinawa became a main US staging point.