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13 of Britain's American colonies "declared war" on Britain when they began resisting British rule, at various times. The Declaration of Independance, which took place after war began, was on June 4th, 1776.

The only time that a country called the United States of America declared war on Britain was 1812, June 18th. The United States invaded Britain's remaining North American colonies, principally Canada, but never managed to take the colony (despite the president claiming it would be a mere matter of marching) due to the outnumbered British and Canadians putting up a massive fight.

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12y ago

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