Which World War was Germany involved in 1937, 1938 and the first half of 1939? WWII did not start until September 1939, and German economy was not at all "everything geared towards supplying the military." If you studied WWII history in any detail at all, you'd know that Hitler was very much against gearing everything towards war due to his lack of faith in German civilian resilience from WWI experience, and Total War did not arrive in Germany until 1943, after the Stalingrad debacle.
The utter failure of volkswagen + autobahn to popularize automobile among the German population in the 1930's was clearly the result of government management failure: political appointees unable to allocate resource efficiently. There was a whole year and half between the delivery of the first volkswagen to Hitler as his personal vehicle and the breakout of WWII. Not a single volkswagen was delivered to the public. The Autobahn was built way too early, by more than two decades given the lack of civilian cars (one decade if there had been no war). War was the result of inefficient economic policy by government, as the political appointees had to look for more victims to loot after the domestic wells ran dry.
I can certainly agree with you that the rich and powerful has undermined the American system of government, except you have the scales all wrong. It's not 1% (3 million people) vs. 99% but 0.02% vs. 2% and much of the next 20%, with the remaining 80% looking on and being misguided about half the time. It is top 0.02% or about 60,000 men, like Warren Buffet who has taken tens of billions in bailouts via WellsFargo, GoldSachs and his massive SP500 future puts, who advocate raising taxes on the next 6,000,000 people (2%) and 60,000,000 people who account for the vast majority of tax payment in this country.
Both Obama and Bush were for transferring money from the average American taxpayers to men like Warren Buffet in those bailouts. So that should tell you something about presidents from either party regarding monopolies.
Which post-WWII Germany are you talking about? East Germany? The West German economic miracle of the 50's and 60's was very much the result of low taxes and low regulations. If you want to see how high government spending and strong union would produce, both East Germany and pre-Thatcher UK would give the examples. In more recent years, German economic growth has been simply the result of scaling West German economic success into former East Germany, slightly more than offsetting the rising government spending and strong unions gradually hollowing out what was formerly West Germany. If you look to places like Breman, you will see that in spades, just like Detroit, time delayed by a couple decades.