America saved the world in WWII

In response to a red-neck U.S. soldier pouring scorn on the polite and peaceful Canadians, trotting out the same old drivel about how the world should be grateful that America saved them in World War II:
For Americans who don’t know history, here is a quote from Sir Winston Churchill taken from British Parliament records June 10, 1943: “On the European front, the most important development of the past year has been the crushing offensive of the great armies of Russia against the powerful German army. Those Russian forces have destroyed and are destroying more of the armed power of our enemies—troops, planes, tanks, and guns—than all the other United Nations put together.”
That was a few months after the Battle of Stalingrad and shortly before the Battle of Kursk was to begin. After the Battle of Kursk, Hitler was practically finished. He had nothing to stop  Soviet tanks from rolling into Berlin. The Soviet Union had crushed the German war machine single-handedly with no direct help from their Western Allies, who had been promising a second front since after Pearl Harbor (mostly empty promises). That was in the fall of 1943, nine months before the Normandy Landings. Soviet Red Army did in fact enter Berlin, not the Western Allies.
The Soviet Red Army also went to Manchuria and crushed the 700,000 man Japanese Kwantung Army (+200,000 subsidiary) within a 10 day campaign, contributing to Japan’s decision to an unconditional surrender.
As for defeating the US military, it first happened during the Korean War, when poorly armed and poorly equipped peasant soldiers from China with no preparations and no winter clothing for -40 winter warfare had to  brave unchallenged bombing from the air to drive the American soldiers back to the 38th Parallel. The American soldiers were so happy they got out of North Korea they characterized their retreat as advance in the opposite direction.
Only some ignorant Americans would believe that they alone saved the world. Most Americans who have studied history know the truth.