Britain's victory in the Battle of Britain demonstrated the courage and resilience of the country's military and its people and allowed them to remain free from Nazi occupation. It also enabled the Americans to establish a base of operations in England to invade Normandy on D-Day in 1944.
Because they controlled the gold & salt trade.
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Disadvantages of war include death and injury of large numbers of people, loss of economic resources, destruction of the environment, loss of productivity and lasting damage to military personnel.
