So I spread my mighty Empire with Republic, trade and culture and finally, at late 1400s, control most of the western/southern Pangaea, playing as Americans. I just got pissed off with slow advance, so I tried to simulate the world progress with notorious "ask a ****load of gold per turn" cheat, which then backfired because I grew happy with my scientific progress. Well, just one game.
Suddenly, out of the blue, Greece decides that US is going down. Dunno why, because I gave them luxuries and technology. So I move my forces to prepare to pay back.
Then Zulus declare war on me. Iroquis declare war on Greece and me. China attacks Rome and Greece, and Rome eventually declares war on Iroquis, me and Aztecs. Aztecs freak out and declare war to Greece and Germany. Everyone declares war to me, then asks for peace and some really bizarre military alliances. Zulu asks for peace, I accept. Aztecs declare war on Zulus. France declares war on just about anyone.
At this moment I have managed to force peace on my immediate vicinity, but am still at war with 8 nations, all of which declared war on me with no apparent reason and refuse to accept my emissaries. My population is slowly getting more and more war weary, and the entire world is now a cluster****. I tried supporting some local powers on the other end of the world, and now everyone's busily slaughtering each other. My trade has fallen down, I have hard time trying to beat back the sudden little attack Russians or Babylonians throw at me (again, with little or no reason), and generally it's like a WW1. Thank god I'm at peace with my largest neighbours at this moment.
I mean... WTF. Add the fact that galleys just owned my ironclad and my cavalry is quite often won by spearmen. Yeah right gg nextmap.