While I waited for an answer from the Mayan guide, I played the Mongolians. They're pretty fun actually! The three UHV's are actually pretty easy to get if you know what your doing (Despotism and spam Keshiks and Mangudais hehe). My only problem is trying to not collapse as the Mongolians. The overextension is killing me. I lacked 3 more cities to achieve UHV 3 when my whole civilization collapsed. Pretty sad really. I tried whipping my Chinese subjects for those extra Keshiks and Mangudai but it does not even lower the overextension limit. What should I do?