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GalCiv3 Forums
I see that you can create teams when starting a new game, will this align AI factions? If so do they need to be same ideology or not?
I assume if they are a team they won't attack each other?
They don't need to be the same Ideology. At least, it doesn't complain if you assign teams across ideologies. I haven't seen them attack each other. I haven't seen them particularly support each other, either. In an MP game, being in a team means you get to see each other's map and you can do diplomacy any time, not much more.
Haven't done it in three, but in two it was a kind of bummer; because when you assigned teams with the editor then you automatically had contact with your enemies. I was trying to make it more like lore.
Along w/ what erischild stated, they do, however, when on teams tend to declare war on you as a group versus one at a time. But, when you declare war they don't join in.
I am so used to getting ganged up on that I have never noticed if they are on the same team! 
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