The next Nazi's won't come out of Germany. In 20 years when their numbers are strong in France, England and other European countries the Middle East will take over these countries with a minimum fight. One by one various nations will fall under Sharia law. When China sees their money crashing from sales of exporting their crap they will join Russia and the US against the Sharia Axis countries in World War III. The war will be fought like World War II where no distinction between civilians and military will be made. Just like Dresden, Hiroshima, and Nagasaki were made into ghost towns of death.
Fiction but it could happen.