Enlighten me please: Does the Two Party system in the USA results in a 'it's either black or white' society?

With black or white I mean two extreme sides.
From what I understand from it, one part(y) is Pro Life while the other is Pro Choice, one is for owning guns while the other is against, and one is in the Intelligent Design camp while the other is in the Evolution camp, etc., etc.
In these controversial subjects, are/will there ever policies (being) made that are compromises between the two extremes?
If not, does that (the fact that there is a two party system, thus (just) one party is governing) mean that the USA will forever be/stay a divided nation?
Would a third (and/or fourth and/or fifth, etc.) political party make for a more mixed government and therefore for (more) mixed policies?
Edit: And a more mixed society?