the Aryan Race

One thing that differentiates fascism from other political philosophies is its racial aspect. Hitler was famously anti-Semitic but he was also interested in eliminating many other races. For example, he called the Slavic races "mud people" and many believe that his interest in breaking the non-aggression pact with Russia was so he could have a free hand in removing as many of these people as he could as quickly as possible.

Why then did Hitler take on the Scandinavian countries, England and later the US, all of which contained a high percentage of people that fit the mold of the "Aryan Race?"