Akey part of the mayflower compact was that the colonists

A key part of the mayflower compact was that the colonists all agreed to certain rules and limitations that were to be imposed in the new colony--all meant to help ensure their survival, in one of the first technical written "constitutions" of the New World. 

It means to create the laws.

Explanation:

The legislative branch creates a bill which is then voted on by the house of representatives and the Senate. If the bill manages to get the majority of votes. It moves on to the executive branch.