moctezuma is probably the worst AI of the game
I won't say he's that bad, its prince difficulty, and he's fielding infantry and i was fielding infantry only to recently upgrade em to mech infantry for free. He actually managed to take stockholm city early ingame and it was in my way of expansion so i took it from monty.
Anyways, I can understand that Monty likes to fight. But I thought they respected number of soldiers, I just understand it don't matter now XD
And picking a fight with world's biggest power can be possible imho, if you see some excessive outlying cities on fringes of the world power you can easily start a war to pare the world power of them while it's busy. I have done stuff like that.
Aztecs did have a pretty decent navy but it split up into two, went up north to fight with my navy and went south to shell and sink geneva's ships and then flee in fear after a couple of rocket artilleries of mine showed up and after aztecs fled, i gifted those two units to Geneva.
Generally, aztecs made a couple of bad decisions, bullying my pets. And then splitting its navy up into two. it had wooden ships and iron clads and bunch of modern ships as well.