Interesting fact, you're completely wrong.
http://i.imgur.com/2GHdRDg.jpg
That is a map of the usage of the names for football. The word Soccer is a British invention, but its roots trace back to 'Association Football'. It was called Football long before Soccer.
And that's the thanks the Americans got for liberating Europe.
You realise we have our communist friends in the motherland to thank for that far more than America. America came into a won war in its dying hours and speed it up. Without America Europe would have been won by the allies by about 1947 or 1948. Asia is a different story but Asia has nothing to do with 'liberating Europe'.
The most important turning point of WWII was not D-day, as Americans are taught. It was the Battle of Stalingrad. The Russians won the first allied battle in WWII at Stalingrad and continued to win battle after battle, pushing the Germans back out of Russia and eventually being the army who would go on to invade Berlin.
Would the war have been won without American production? Probably not. It's still hard to say though because Russia had another few thousands of kilometres of Siberia to fall back to, all the while using Gorilla tactics and massive minefields to make the Nazi's life a living hell. There is no question that Western Europe would have fallen however.
There are also plenty of other countries who economically fuelled WWII who were about as pivotal as the USA in this respect but are talked about far less.
No one talks about the Indians, who were a major supplier of just about everything to England. The amount of food relief that got through to England from India kept them in the war.
No one talks about the Portuguese and Brazilians who single handedly kept Europe's economy ticking over during WWII after the fall of the major economic player in Europe, the Dutch. Having a local economy and banking system that still works is actually surprisingly important to winning a war.
These nations contributed similar amounts of food and overall stability to Britain as America did production and raw goods. Without any of these nations as well as several others Britain would have likely fallen.