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The isolationist-interventionist debate never really came up in the actual Fall Campaign in 1940 since both FDR and Willkie were committed to aiding Great Britain short of war. However, it's conceivable that either Vandenberg or Taft, both isolationists, could have gotten the Republican nomination.

My question is more how this relates to Churchill's decision-making and the Battle of Britain. At the point of November 1940 the British had pretty much staved off any potential German invasion due to the RAF's victory over the Luftwaffe that Summer. However, without U.S. aid in the form of Lend-Lease, it's hard to see from an economic perspective how they continue with the war.

Much of Churchill's grand strategy involved Britain forming a close relationship to the U.S. and trying to encourage a greater role for the U.S. in helping the war effort.

An isolationist getting elected pretty much puts this strategy in the trashcan. Having proven Britain's resistance to invasion, does Churchill then try to negotiate with Nazi Germany from an improved position at that point? Or would Britain have relied on the possibility of Soviet entry into the war as an eventual ally?
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