Multi-polar Europe was a chaotic tinderbox...
Imperialism certainly was anit-democratic...
Avoiding both world wars would very likely either save the imperial order or at the very least make it's ending, umm non-utopian

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China is such large percentage of the world's population.
POD the Nationalist win in CHina with significant American Aid, forging a long lasting alliance, greatly accerlerating economic growth for China with ever growing positive economic ripples.
Thus either no Korean War or a much more limited one, (China, if it intervenes, does so on the US side).
Either no VIetnam War or French victory.
THis prevents the various 60s social movements from becoming tainted with Anti-americanism and/or communist sympathy.
With overall better world economic health and western confidence, lets butterfly in a French challenge to the US, but instead of OTL whining and undermining of US policy, a post-Apollo programe to put a French man on the Moon!
Leads to second space race in the mid-70s. Another way to accelerate tech. Use of more advanced systems.
Healthier world economy and inter-national community reduces appeal of Islamic extermism and Soviet encouragement in the Arab world, fewer Arab/iSRAELI wars.
Soviet crisis takes place in a world with ongoing space exploration (budget drain) and stronger west. Even less possiblity of Cold War going hot.
Gorbechev reforms work better, transistion to democracy goes smoother and sticks.
2000 NATO AND EATO (East Asian Treaty Organization) merged.
All 5 veto members of UN, America, Russia UK, France, and China are allies, democracies and working together.
MOvement begins to expand permanent Council to include India, Brazil and Japan. It is telling that it has become assumed that democratic goverment is part of the definition of a world class power.
Ohh, and the space programe has amoung other things, lead to Solar Power Satellites by 2007.
Construction of a beanstalk begins 2008.
Whew, strangly short of breath