The Battle of Britain was more than a military victory. It was a critical psychological and diplomatic victory as well. The psychological impact of defeating the apparently invincible Luftwaffe was enormous at the time. The RAF had proved that the Luftwaffe could be beaten, and by inference that the Wehrmacht could be beaten as well.
This fact alone encouraged anti-Nazi resistance movements and kept hope alive all across occupied Europe. Even more important, however, was the effect on the United States. At the start of the Battle, the United States had largely written off Britain as a military and political power. As a result of British tenacity and defiance in the Battle of Britain, the United States revised its opinion of British strength. Because of the Battle of Britain, the U.S.A. shifted its policy from ‘neutrality’ to ‘non-belligerent’ assistance.
With American help, Britain was able to keep fighting until Hitler over-extended himself in the Soviet Union. If the United Kingdom had lost the Battle of Britain, it is unlikely that it could have provided assistance to the Soviet Union, and even less likely that the United States would have been drawn into the European war. Without American help, it is improbable that Hitler would have been defeated. In short, the Battle of Britain was the necessary pre-requisite for future victory in Europe.
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