Pre 1940s Europe is a transnational jumble of overlapping ethnic groups. Result: war after war after war.
Post 40s and 50s after millions of people relocate to their linguistic and ethnic homelands and coalesce into new nations carved out of empires: lasting peace. Last major war was in former Yugoslavia, which failed to get with the ethnic nationalist program.
Hell, even Belgium is falling apart now. You are dead wrong on this. Ethnic nationalism is the only system that works, long term.
You conveniently left out the late 1930s and 1940s, in which a nation-state perpetuated ethnic war and genocide before being stopped primarily by two fairly transnational states.
Would you be interested in a summary of 20th century armed conflicts, classified by the type of states involved? There are a couple in Asia and Africa I'm thinking of.
Pre 1940s Europe is a transnational jumble of overlapping ethnic groups. Result: war after war after war.
Post 40s and 50s after millions of people relocate to their linguistic and ethnic homelands and coalesce into new nations carved out of empires: lasting peace. Last major war was in former Yugoslavia, which failed to get with the ethnic nationalist program.
Hell, even Belgium is falling apart now. You are dead wrong on this. Ethnic nationalism is the only system that works, long term.