Imperialism is the idea that a country should try to become as powerful as possible. This usually involves lots a wars and domestic and foreign affairs. Isolation is the idea of not being involved in domestic and foreign affairs. This includes no involvement of war and isolation from the rest of the world.
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The Battle of Britain was the first major campaign to be fought entirely by air forces, and was also the largest and most sustained aerial bombing campaign to that date. The Battle of Britain marked the first defeat of Hitler's military forces.
