Totalitarianism is a form of government, where when anyone speaks up against the government, they get shot. People supported totalitarian leaders like Hitler, because they believed (in Hitler's supporters case) that the Jews had stabbed Germany in the back after WWI, that communists had done the same, that the Treaty of Versailles was unfair to Germany, that the Weimar Republic was ineffective, that Germans were separated from each other (after the border changes of WWI), and thus should be reunited. They also believed that Hitler was some great savior of Germany.
The best description about Germany annexing of Australia Is that, Hitler stole Australia's integrity in violation of international law.
Australia was annexed in its incorporate and entirety to Germany as Ostmark. The union of Australia and Germany was forbade by Treaty of Trianon and Treaty of Versailles violation.
The USA and Canada both have a rich supply of minerals, forest recourses, and energy. The USA also has rich supplies of other materials, such as coal and iron.