Democratic nations fighting each other

I was thinking about this question a few years ago, but have two genuinely democratic nations ever gone to war with one another? I couldn't think of an example, but I may be overlooking something.
 
There’s a lot of equivocation around this issue, you mentioned “genuine democracy” yourself but there is also nitpicking about what constitutes “genuine war”. Finland and the U.K. were at war between 1941 and 1944 for example but the direct conflict between the two was minimal so some argue that it doesn’t really count as an example.
 

Deleted member 1487

I was thinking about this question a few years ago, but have two genuinely democratic nations ever gone to war with one another? I couldn't think of an example, but I may be overlooking something.
WW1. Depending on what your definition of Democracy is.
  • First World War: The Polity IV dataset does not rank any of the Central Powers as democracies, although the component of democracy for Germany had been higher than that of autocracy since the 1890s, when Bismarck was replaced by Leo von Caprivi;[17] neither does the somewhat controversial[18] ranking of Tatu Vanhanen;[19] on the other hand, all of the Central Powers had elected parliaments; the Reichstag had been elected by universal suffrage, and voted on whether a credit essential to the German conduct of the war should be granted. Whether this is democratic control over the foreign policy of the Kaiser is "a difficult case"; Michael W. Doyle concludes, however, that the government was not absolutely dependent on the Reichstag - and that Germany was a dyarchy, effectively a mixture of two different constitutions, and democratic on internal affairs.[20]
 

RousseauX

Donor
I was thinking about this question a few years ago, but have two genuinely democratic nations ever gone to war with one another? I couldn't think of an example, but I may be overlooking something.
Athens vs Syracuse during the Peloponnesian war, both were democracies with elected leaders
 
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