Both the democratic and republican parties would support the idea that the united states should

Both the Democratic and Republican Parties would support the idea that the United States should "stay together" at all costs, although many states such as the ones who seceded from the Union, felt differently. 

The way this small state - large state compromise guards against tyranny is that small states and large states have one note: i am sorry but i was not able to give you the full answer. but i got this answer from