Political map of the Arctic & the Far North 10 September 1939 (Outbreak of World War II): While Norway and Denmark were disputing ownership of Eastern Greenland (Erik the Red's Land), Japan invaded Manchuria (Japanese invasion of Manchuria) and Hitler (Adolf Hitler) became Chancellor of Germany. By the end of the decade, the expansionist policies of these two nations were threatening the existing order. When Germany invaded Poland in 1939 (Invasion of Poland (1939)), Britain and France declared war, with Canada following suit a week later.