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War Plan Red was a plan created by the United States Army in the late 1920s and early 1930s, in the case of a hypothetical war with the British Empire (which were the "Reds").
The plan never took place, but what would would be the aftermath of War Plan Red be like? What would relations between America and Britain be like afterwards? How would the rest of the 20th century be different with America more Anti-British than in our timeline?