The Atlantic Charter provided cover for further negotiations about cooperation if Britain and the United States fought alongside each other. Their rapid integration after American entry rested on groundwork laid before they became formal wartime partners. That preparation is estimated here at roughly 18 months to two years. The duration depends on which earlier meetings count toward the relationship, so it does not establish one precise starting date.
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Allied integration drew on months of earlier negotiations
An estimated 18 months to two years of preparatory talks help explain the speed of cooperation after American entry.