What countries did Germany take over and then invade in World War 2?

Prior to the outbreak of World War 2:

• The Sudeten region(s) of Czechoslovakia (38)
• Austria (38)
• The rest of Bohemia and Moravia (39)

The Germans invaded during the course of WW2 :

• Poland
• Denmark
• Norway
• Luxembourg
• Belgium
• Holland
• France (partial)
• Monaco
• Yugoslavia and Greece (with the help of Italy)
• Lithuania
• Danzig
• Latvia
• Estonia
• The Soviet Union (partial).

Germany's allies in Europe were:

• Italy
• Romania
• Bulgaria
• Hungary
• Croatia
• Slovakia (formerly a part of Czechoslovakia)
• Finland

The Czech part of Czechoslovakia was a German protectorate (colony) called Bohemia and Moravia having been taken over in 1938 after the Munich Conference.

The neutral countries of Europe were:

• Sweden
• Switzerland
• Liechtenstein
• Turkey
• San Marino
• Andorra
• Portugal
• Ireland

The Germans wanted Lebensraum (living space) for their German people so they tried to regain the land they lost after WWI due to the Rhineland being demilitarized and the Treaty of Versailles.