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Reason
Answer
For Hitler, this fulfilled two aims. One was to unite the German speaking people of this region with Germany, supporting his goal of a larger, united German nation.
Czechoslovakia
A move known as Anschluss, the rightful expansion of German borders
Austria
An easy target, with agricultural land and a small population
Poland
Convenience, rather than strategy - military stronghold in the north
Denmark
A neutral country that had vital trade routes with ports in the North Atlantic
Norway
Not France, but used to invade France
Belgium
Reason
Answer
Invading Belgium broke a treaty, and Hitler feared retaliation from this country
The Netherlands
They've hated each other for over a century, but a treaty with Poland 'justified' this invasion for Hitler
France
These islands were closer to France than to the mainland, and were convenient to occupy
Channel Islands, Britain
Opposed to the ideology of this country, and although they were allies.
Soviet Union
Technically, this country was invaded by the Axis and the Allies in 1943.