George H.W. Bush gets the US into a war with Iraq that we can win; his son gets us into two wars in Asia we may not win.
Germany's eastern enemy was defeated at great cost, but holding the territory also proved quite costly in sheer manpower. As it became obvious the war could not be won on the remaining fronts, the Kaiser abdicated. The Kaiser having never had good democratic credentials, war-mongering became linked in the public's mind with undemocratic government. Promising peace, the Social Democrats gained power and found they could not solve the problem of ending the war while saving face.
George W. Bush is elected twice with questions about whether the system is giving the promised democratic result. (Others question whether democracy was a sensible goal in the first place.) In any case, his designated successor hangs his own chances for election by promising not to leave the fronts without achieving victory. The Democrats gain power promising peace. By 2010, they still have not ended the war on either front, probably due to the glib assertions along the lines of "We can't just walk away."
The early government of the Weimar Republic created hyperinflation due to a combination of debts, reparations, and the destruction left over from the two-front war. Nevertheless, permissive morality and globalist cultural ferment made Germany in the interwar period very productive in terms of art, science, and architecture.
Despite the multicultural vibrance of America, it is not clear to many economists if our current debt crisis can be resolved without large increases in the money supply.
Hitler took power capitalizing on German fears of foreign enemies, cultural decadence, and a state riddled with leftists. Legitimate though some of the fears may have been, Hitler was in power a scant six years before plunging Europe once again into chaos. Notwithstanding his facile reputation of being right-wing, pro-white, and Catholic, he proceeded to destroy conservative Catholic regimes in Austria and Poland, slaughter millions of Slavs and Ashkenazim, and align himself with the most advanced non-white nation of his time (Japan). From there he moved on to an unwinnable two-front war.