Based on historical perspective, the vital partnership that adopted the strategy to defeat Germany with US military forces in the Atlantic and European theaters and to defend the Far East at the same time is "The Big Three."
The Big Three Partnership is a partnership between the United States, Great Britain, and the Soviet Union.
This significant partnership was formed between these leaders: Joseph Stalin (Soviet Union), Franklin Roosevelt (United States), and Winston Churchill (Great Britain).
The Big Three partnership is mainly referred to as the Grand Alliance, which was made to defeat Germany and the Axis powers in world war II.
Hence, in this case, it is concluded that the correct answer is "The Big Three."
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