Why was the outcome of the Battle of Britain important of for the Allies?

Because at the time,Britain was the only major Ally in the war,so it would have been catastrophic if Britain fell to the Nazi's.It also marked the first defeat of the Nazi's.

Explanation:

A significant turning point of World War II, the Battle of Britain ended when Germany's Luftwaffe failed to gain air superiority over the Royal Air Force despite months of targeting Britain's air bases, military posts and, ultimately, its civilian population.

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