An empire-only or America-only war cannot be modeled by simply adding Axis forces and subtracting an ally. A British Empire fighting without US support might face a much deeper Japanese advance into the Indian Ocean and India, requiring broader mobilization of imperial manpower and industry. Removing Russia also keeps supplies flowing into Germany, while removing America eliminates crucial external support for Britain. Removing the British Empire erases Pacific commitments and the political bridge that might draw the United States into a European war. Alliance networks, geography, logistics, and political causation determine whether separate conflicts fuse into a world war.
Notable Point · 7:40-12:36
Why removing one Allied power rewrites the whole war
Deleting Britain or America also removes bases, supply flows, political connections, and enemy distractions rather than merely subtracting ships and divisions.