"The Big 3" was a nick name given to the US, the UK and the USSR during World War2 (not World War 1). In World War 1 it would have been the French, The Brits and The Americans who were the largest of the alliance fighting against Germany.
This is just a guess but, if you are talking about World War I as oposed to World War 2, I'd day "The Big Three" would comprise of France, UK, and the United States.
It could also mean the 3 main Central Powers, Germany, Austrian Hungry Empire, and Turkey.,
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First world war. Great war.
If you're referring to the big 3 political leaders in the years following on from the second world war and during the cold war, then they are Churchill, Stalin, Roosevelt. But then, Roosevelt died and was replaced by Truman, meanwhile Churchill was replace by Atlee. Eventually Stalin died and was replaced by Khrushchev. In any case the big 3 were Great Britain, America and Russia, regardless of the leaders.
trench warfare was a big one
US, England and USSR were Big Three
Big and Bigger. Please ask answerable questions if you want a sensible answer.