Aztecs and Denmark were next to one another but I didn't see them war at all since I discovered them in Renaissance Era. I forgot to mention Mongolia and Mongolia was next to Persia. Mongolia took one Persian city and stopped warring with Persia anymore. What annoyed me was that a Korean city was forward settled to the Aztecs and was basically isolated from the other Korean cities. Yet, Aztecs didn't do anything about it. All of these civs were on a separate continent with Mongolia technically closest to me but Persia is certainly much closer as they share a direct border.