Of course you claim that Europe could win that war all by yourselves without the help from the USA. lol
You need serious education.....
Did America win WW2 in Europe?
No they did not. I could go on a massive rant about this but I'm going to keep it short and sweet. The following mentioned nations all made massive contributions to winning World War Two for the Allies:
The Soviet Union had the most casualties during World War Two, they alone took on over 60% of Nazi Germany's forces during World War Two. They were instrumental in Nazi Germany's defeat. Furthermore they also massively helped with defeating Imperial Japan as they invaded and occupied the Japanese puppet state of Manchukuo.
The UK/British Empire did most of the heavy-lifting when it came to destroying the Axis power's naval power. The Royal Navy single-handedly obliterated the Kriegsmarine's (Nazi German Navy) surface fleet by sinking their warships such as the Bismarck. The Kriegsmarine still operate for years after that but only with their U-boat submarines which they used to torpedo Allied troop and cargo convoys in the North Atlantic. Against the Japanese, the Royal Navy also did quite a lot of the fighting against the Imperial Japanese Navy. In terms of air power the Royal Air Force (RAF) was highly instrumental in destroying Nazi Germany, for starters after the Battle of Britain (which by way the UK won without US support as they had not entered the war yet) the RAF had more planes than the Luftwaffe did. During the Allied invasion of Nazi Germany, the RAF was actively engaged in bombing military bases and cities that were of vital strategic importance, for example we bombed Dresden because of the fact there were a lot of factories producing weapons there. Finally in terms of ground power, the British Army and Royal Marines were highly useful in North Africa, they defeated the Italians and did most of the work with the Germans. They also made up the third largest contingent of troops in the Normandy Landings (D-Day) after the US and Canadian contingents.
Canada's Navy (Royal Canadian Navy) did a lot of the fighting when it came to fighting the Axis. Did you know that after World War Two Canada's Navy was the 3rd largest in the world? Furthermore as I have already stated, the Canadians made up the second largest contingent of troops in the Normandy Landings. Canada for the most part liberated the Netherlands from the Nazis.
China's Army actually did a lot of the fighting against the Japanese. Did you know that China had been single-handedly fighting Japan for 5 years before the US officially started helping China in 1942 after the attack on Pearl Harbor? China had been fighting Japan since 1937, in fact they fought a conflict with Japan as early as 1931 after the Mukden Incident which resulted in Japan seizing Manchuria. Anyway I digress, the Japanese lost half a million of some of their best troops in China fighting against the Nationalist Kuomintang and the Communists. Later on Chinese troops were very useful in helping the British in Burma.
Australia actually sent a lot of their troops to fight in Europe and Asia. The support of ANZAC troops in Europe and Asia was a massive aid to the Allies.
In conclusion World War Two may not have been won without the US but this hardly means the US won the war for the Allies. Put it like this if the US didn't have the support of the other Allied nations then they wouldn't have been able to win the war. Operation Overlord (Normandy Landings) was only possible because over 60% of Nazi Germany's ground forces were busy fighting the Red Army in Eastern Europe. Also need I remind you once more that the US were not the only people that served in Normandy, Canada sent the 2nd most troops followed by the UK sending the 3rd most troops. Furthermore one must actually realise that the answer to which nation contributed the most to winning the war is not really clear cut. The USSR contributed the most ground forces, they took on the bulk of Wehrmacht and they lost the most troops. In terms of who contributed the most in air power, it was the US that contributed the most albeit closely followed by the UK. In terms of naval power it was the UK albeit closely followed by the US. Now tell me which contribution is more significant? I think you will find that the answer is neither. Put it like this the Soviet Red Army may have took on the bulk of the Wehrmacht but this would have been to no avail if the Luftwaffe was not destroyed by the US/UK. The RAF and US Army Air Force and US Navy Air Arm systematically destroyed the Luftwaffe and engaged in aerial bombardments of vita strategic places e.g. military bases, cities, troop movements and arms factories etc. If the Luftwaffe wasn't defeat then I think you will find that they would have blown the mass Red Army troop movements to smithereens. If the Kriegsmarine was never destroyed by the Royal Navy then the Red Army may not have pushed back the Nazis, do you know about the Red Army's encirclement of approximately 300,000 Wehrmacht troops in the Baltics (specifically mostly modern-day Latvia)? Imagine if the Kriegsmarine was not destroyed by the Royal Navy, they could have launched an operation to evacuate all 300,000 Wehrmacht troops in Latvia in the same way the Royal Navy evacuated 400,000 troops in Dunkirk after the Battle of France. So tell me, how would the Red Army have felt about taking on an additional 300,000 troops when they came to invading Germany? So in short World War Two was a very much a team effort, all the main members of the Allies contributed immensely in different ways.