_1.     What were the first three European territories invaded and conquered by Nazi Germany?

The first three European territories invaded and conquered by Nazi Germany were:

1. Poland: The invasion began on September 1, 1939, marking the start of World War II. The attack on Poland was in direct violation of the Treaty of Versailles, which ended World War I.

2. Denmark and Norway: On April 9, 1940, Germany launched Operation Weserübung, a campaign designed to secure the German occupation of both Denmark and Norway. Denmark was invaded and occupied in a matter of hours, making it the second European territory to fall to the Nazis. Norway was invaded on the same day, but it took a little over two months for the country to be fully occupied.

3. France: The Battle of France began on May 10, 1940, and ended with a German victory on June 22, 1940. This marked the fall of the third European territory to Nazi Germany.