And generally the evidence is that if both countries are more democratic they are less likely to war. But only one having more democracy doesn't affect how likely it is to war with a more autocratic countryChoose Democracy: I have never seen more than one AI Civ choose that ideology in any game so far: they are all in love with Fascism or Communism, so if you require opposing Ideologies to make a game plan work, Democracy is the way to go.
- And if the idea of a War-Mongering Democracy seems a bit contrary, just take a look at the actual historical records of the Democracies (UK, USA) relations with any of their smaller/weaker neighbors since 1840 (Opium Wars, Mexican War, Afghan Wars, Zulu War, Boer War, Spanish-American War, Philippine Insurrection, etc, etc) . . .
(which fits with the strategy... go democratic so you can crush all the less democratic countries
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