Most important country in defeating Germany in WW2

Definitely you really are an expert of the Eastern Front (to say it neutrally)! And I wouldn't want to force anyone do anything or repeat myself, but seriously join the Historical Society!

But it's not about previous posts, you have a debate with one of the leaders, who are Gerd von Rundstedt and John Marston. You tell your area of expertise and then they ask you questions from that area. The questions are not like in which year did Germany invade Poland, but rather like my first question: What were the reasons for the Crimean campaign (WW2) in your opinion?

Just an example. That was the first question I was asked and I am not the person to ask the questions.

If Britain fell during the Battle of Britain and temporarily surrendered, would Europe 1939, excluding Italy's campaigns and Germany's interventions, have been called the War of the First Anti-Fascist Alliance? 🤔

If Japan had chosen not to attack the USA, would the wars in Europe and the Pacific been named differently?

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I believe that Britain also played a massive role as well:

Britain did try to push the USA to join in which influenced American politics at the highest level.
Britain was the key behind the Allied effort in holding the Luftwaffe at bay, Hitler's political miscalculations (concerning Britain's situation in 1940 and Italy's failures) and the opening of new theatres of war. These actions diverted more Axis resources away from Operation Babarossa and struck at the corners of overstretched Axis controlled lands, chipping away even more resources.
Britain had also carried out operations against key targets such as neutralising "potential threats" (neutral or Vichy supporting French assets, nationalist anti-colonialist groups, etc.), seizing key bases or positions and providing bases to operate from for the Allied counterattacks later on, outside of the USSR. Eg. The British Isles were vital for attacking France, Britain pressed Australia, Burma & India to participate which allowed for the Americans to intervene economically or militarily from Japan's corners, and Egypt was a good staging ground for invading Italian Libya, etc.
Britain had also backed various resistance groups (Yugoslav, Italian, French, etc.) and hosted any Allied groups that could escape from conquered homelands, providing places for Allied countries to regroup at and fight back from.

Japan gave the American citizens and the US Government a strong moral and firm practical reason to go to war. No need to debate American and Soviet contributions here.

China did also bleed the Japanese out and tie down a large amount of the IJA which weakened the Japanese Empire's ability to conquer and hold more territory. Chinese resistance against Japanese invasions and Japanese atrocities in China had also pushed the American public and politicians to be more willing to go to war and take some steps towards this.

The Free French forces did join in on key offensives that ended the war in North Africa and liberated Western Europe. Those that sided with de Gaulle would have provided bases to strike at Axis forces, collaborators or "neutral" states that held worth.

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Never forget the role of various parties and their contributions, both big and small. For a war on this scale across so many territories, every group or person played some part that should be recognised.

United Kingdom. Nothing more to say.

Yeah, but I purposefully left it out.