What main political groups existed in the colonies? and how did they get their name? so much for the

That really depends as politics were constantly changing through the course of history. If you're referring to the time around the constitution, then the main political parties would be the Federalists and the Anti Federalists in which the Federalists were in favor of a strong central government while the anti Federalists scorned the idea in fear of a repeat of their much hated former king.