This is a difficult question due to the fact the the major three each played a crucial role in defeating Nazi Germany. Without Britain, the Germans would have conquered all of Europe and then been able to focus on the Soviet Union. Also without England, there would have been no place to stage Operation Overlord. This means that they would have had to invade Europe thru southern France. The Germans would have made this the key point of resistance.
Without the Soviet Union, the Wehrmacht would have never been bled to death. Remember Churchill could not believe it when the planners told him they were concerned that the invasion of Sicily might fail because there was the possibility of 2 German Panzer divisions. The Soviets dealt with well over 150 divisions on the eastern front. Also the losses suffered by the Soviet Union would have forced either the UK or the US to the negotiating table. The Soviets lost, some say, over 20 million direct and indirect combatants.
And then there is the US. Without lend lease, neither the UK nor the Soviet Union could have continued the struggle. Also the US' daylight bomber campaign destroyed the Germans ability to make the implements of war. Without these two ingredients the Germans would have won. So to answer your question it is really impossible to say that this or that country was the key to the defeat of Nazi Germany. Without the UK, there would have been no US lend lease. Without the Soviet Union, the Germans would have been able to concentrate solely on the UK and destroyed them. Imagaine no Operation Barbarossa. This would have meant that Hitler could have sent as many Panzer divisions to Rommel as he needed. Also he would have had ample Luftwaffe assets to drive the Royal Air Force from the skies. In this scenario, Rommel would have succeeded in defeating the British 8th Army, seizing Egypt and the Suez and ultimately all the oil in the Middle East. And never forget the southern route for lend lease, with the Germans in control, this would have been closed. And this might have also forced Turkey into the war, although it is arguable whether this would have been a help or hinderance upon Germany, as Turkey was not ready to fight a major war. And we all know that without the US the other two could not have managed to keep on fighting the Germans.
All the Allies supplied men and fought with honor to defeat the Nazis. It was a joint effort of all Allied countries, but two biggest contributors were Soviet Union ( Russia) and United States. No wonder that they became superpowers after the war.
Soviet Union, in my opinion the biggest contributor, fought most battles on the ground and was responsible for destruction of 80% of German army. It received very important help from United States but that help amounted to only 7% of Russian own war production. Also 7 out of every ten German soldiers served on the Russian front and Russians broke the back of the Germans at the battles of Stalingrad - bloodiest battle of the war - in winter 1942-43 and Kursk in 1943 - the largest land battle and biggest tank battle in the history of man.
United States was the largest supplier of material and Americans fought bravely many battles. But the greatest American battle of D-day came rather late in June 1944 and at that time was called Second Front. Much larger First Front was in Russia. Americans and British also contributed to victory by strategic bombing, but it brought significant results only by the end of the war.
There is also opinion that Britain was the greatest contributor to WW2, but it's not supported by facts. British were responsible for destructionof a large percentage of the German army and even that they archived with the help of Canadian, Australian, Polish, New Zealand troops and very large material help from United States,in return Britain trained American troops before storming Omahar Beach ( D day)
Answer
If Britain, alone with the Commonwealth, had not stood up to Nazi Germany 1939-1941 there would have been no "Second Front". Russia was allied with Germany until its invasion, and many of its losses were self inflicted. Britain was pivotal in the winning of WWII, the US supplied men and materiel in Europe later in the piece, although Britains role was crucial.
The US and the USSR both emerged as world powers. All the European countries involved in the war emerged with their relative status much reduced.
The two countries that benefited the most from World War I was Great Britain and the United States. While losses were severe, both of these nations remained nearly intact.
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World War 2
The people of Cuba benefited. The people of Puerto Rico benefited. The people of Guam benefited. The people of the Philippines benefited. The people of the United States benefited. The people of Spain probably benefited in that they received $20 milllion and were rid of the expense of trying to govern their foreign colonies who were in rebellion.
There was a break in the world cup due to world war 2.
The financiers
Part of Germany became theirs, along with a say on the world stage with the rise of the Cold War.
The United States benefited the most from the First World War. France and Germany were particularly negatively affected by the war. The war was fought from 1914 to 1918.
Mexican immigrants
Germany did
The US and the USSR benefited from captured German rocket technology and rocket scientists, which they used for both space exploration and ballistic missile arsenals.
well Europe had benefited from the war and changed their whole perspective about the other countries.
The two countries that benefited the most from World War I was Great Britain and the United States. While losses were severe, both of these nations remained nearly intact.
all haha
In my opinion the russians benefited
Only the wealthy benefited from American investments, but the poor did not.
Only the wealthy benefited from American investments, but the poor did not.