The Second World War erupted when, on 1 September 1939, Nazi Germany invaded Poland. France quickly declared war on Germany, with much of the remaining countries in Europe following suit. United States President Franklin Delano Roosevelt, however, issued a proclamation of neutrality on 5 September. By the end of the year, the Soviet Union invaded Finland, and the Declaration of Panama warned belligerents away from Western Hemisphere seas south of Canada.
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