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Just a crazy thought I had that has to do mainly with what modern languages would look like. The vast number of other butterflies would so change world history that I could never even begin to start identifying them, hence the purpose for this thread. The title says it all.
EDIT: This would probably make more sense with a few other constraints. Lets say the Indo-Europeans, from their starting point on the steppes of southern Russia or Central Asia, never move west of the Vistula, west of the Carpathians, or south of the Danube.