France and the United Kingdom declared war on Germany in 1939 after Nazi Germany invaded what country, starting the Second World War?

Answer Poland

The Nazis believed in a racial hierarchy. Poles were considered racially inferior to the Germans. Hitler argued in favor of lebensraum, policies and practices that argued that racially inferior people needed to be removed (Polish, Slavic, Russian, etc), for the development of racially superior races (Germans).

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