<u>Winston Churchill's</u> stance against Hitler was most significant in mobilizing the Allied powers. Hence, the correct answer is Winston Churchill. Read below about Winston Churchill.
<h3>Who is Winston Churchill?</h3>
Sir Winston Leonard Spencer Churchill, KG, OM, CH, TD, DL, FRS, RA was a British statesman, soldier and writer who served as Prime Minister of the United Kingdom from 1940 to 1945, during the Second World War, and again from 1951 to 1955.
Therefore, the correct answer is as given above
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