
"Power Democracy" takes a bit of fine-tuning to pull off correctly, but it'll allow you to run away with the game if you manage it right. The only downside (a Senate that would veto war declarations and try to force your civilization to make peace during negotiations whenever possible) was negated by the fact that the AI was already suicidally aggressive anyway, and that the player could use spies and their ludicrous piles of money to subvert enemy cities even when not at war.

The upshot of this was that a civilization with these two governments could effectively pour the vast majority of its taxes into luxuries and watch as all of their cities turned into economic powerhouses over a few turns, continuously pump out trade caravans, and use the absurd amounts of money they would soon have in order to rush build any and all units and improvements necessary. Meanwhile, trade caravans could be built and sent to foreign cities for absolutely ludicrous one-time cash windfalls. While other governments simply gave resource gathering bonuses to cities with enough happy citizens, Republic and Democracy governments got those bonuses by default, and happiness allowed for instantaneous population growth instead.

Game-Breaker items from the Civilization series.
