Answer:
Separatists, Mayflower.
Explanation:
it was written down for once (one of the first to be written down, which ensured no one could change it on a whim), it was one of the first steps to self-government; it was not a constitution, just an agreement, but still progress; it was a pact that also especially allowed people to argue point-of-views in town hall meetings (which would later be important)