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Great Britain declared war on Germany in response to there invasion of Belgium.
Great Britain blockaded the American coast to prevent U.S ships from exporting goods to France.
Great Britain and France declared war on Germany, when Germany invaded Poland - so began the second World War in Europe.
September 1, 1939. Germany invaded Poland. Great Britain and France declared war on Germany.
germany declared war on russia and france,great britain delcared war on germany thus europe is locked in battle