[quote=@WilsonTurner]
<Snipped quote by Willy Vereb>

The Stellar Dominion is made up of nations that have less-than-honorable intentions for everyone but them, and they're simply teamed up because the do-gooder democratic and happy nations bound together to stand in our path. The Dominion won't be a permanent alliance, and it never will be- it'd be very, very likely that embassies would be set up, but only that nation's ships would be allowed to ferry foreigners in and out of those systems. It's very, very likely that every member of the Stellar Dominion is spying as much as on each other as they are on the enemy. At this point, it'd be very likely that the ones who sit up top on the Dominion are commonly known to think everyone below them, but no one would argue- yet- for favor of getting assistance against enemies.
[/quote]where did you get this? Most factions rallied under the Dominion's flag because of the Prometheans' power. Either for the advantages and matching aims or because they just didn't wish to be conquered. If you turn against the Dominion then you'd be sieged by dozens of factions hoping to get your territories before the Promethean fleet comes. Besides Prometheans own enough territory and have sufficient military to crush any of their vassals. Or at least their intelligence reports say so. Vassals is a good word here. Basically Prometheans are the king while most player races are counts or barons. Probably with considerably more autonomy in your cases, though.
The Dominion was made before the FPA and it'll survive even after they crush the enemy.