The hypothetical scenario of making all nations the same size

 When great powers have redrawn borders and created nations disrupting the tribal-ethnic character of residents as well as tossing in all kinds of antipathetic religious and economic elements in has tended to produce results akin to placing, large hostile cats in a bag. Wars of succession that eliminate stable leadership have had similar effects.

Africa and the Middle East have suffered more than a little from that kind of experience. Even the trans-Atlantic slave trade was stimulated by the disruptions following the fall of the Songhai empire and chaos in N.W. Africa and the Sahel with the capture and sale of humans ensuing to replace lost economic products like gold.