I'll have to agree on Nazi technology. Nazis are almost as bad as environmentalist when it comes to making their wishes bias what they see in science. In SWE we've had a series of greens enthustiastically declaring that all CO2-emissions could be brought down to null using fuel-cells in combination with electrolysis.
NG giving scientists access to resources brought the world the V2. But as stated by others before, they would have fucked up science with perpeteum mobiles, welteislehre, aether and declaring whole fields of it "Jewish" within a generation. They're really not rational people.
The communists also had some similar ideas (planting seeds in the tundra among others), but on the whole they could be considered quite a bit more rational than the NS.
Today only the small field of population-genetics and related medicine are suffering from political bias, and that's marginal compared to those mentioned before.
Others? Amerindians or Africans being unitied into a civilized worldpower far to easy. Where did the tribal, linguistic and cultural differences go, and the rock-hard conservativism that's present in most backwards societies?
And, most important, everything ends up as good as can be, with the world being unified by a benevolent democratic superpower.
Hell no! If the US and GB wouldn't have had the geographic advantage of OTL-history these ideals might have died in infancy. Parlamental democracy is nowhere near a must to create great powers, although economic freedom might be in the long term.
"Free fascism" ideologies like that of stirlings drakas is underused compared to ones functioning just like today's where the mean states essentially are never very efficent.
Cultural divergences and the effects of these on politics are also underexplored. How about a free, democratic society that views all other races a vermin? Or the opposite, a fascist state where gender and race of a person is considered unimportant? Perhaps even a religious order (although this is unlikely) that decides that science is the way god favors his followers.