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Had Britain refused to give guarantees to Poland in March 1939 and thus Poland would have agreed to allow Nazi Germany to annex Danzig and to ally with Nazi Germany (which appears to have been Hitler's original plan), what would a joint Nazi-Polish invasion of the Soviet Union in either 1939 or 1940 have looked like?

Also, would Britain and France have remained neutral in this war? In addition to this, what would have been the ultimate outcome of this war?
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