Snarkhunter
Prince
Regarding the Hoover Dam - should I be building factory's along with it?. Without the Hoover the factory is a prequisite of the Hydro Plant.
Well, it won't do you much good without factories, unless you are just trying to keep it out of the AIs' collective hands. OTOH, you don't need factories everywhere, either. I never build 'em outside of the Core & occasionally the semi-Core. A dozen usually suffice.
kk

When all this happened I was waring with the Aztec's. I signed peace treaty with them and moved my troops elsewhere. I don't know how this is going to turn out, at least I have airplanes, a good navy and am awaiting tanks which are in prodution.

Seriously they are an optional tech, so the tech can be skipped. There are so many continents and good sized islands, all of which as best invaded with troops and an Army to cover them.