- The Plymouth colony was established in 1620 by English Puritan Separatists known as Pilgrims who traveled on the Mayflower and signed the Mayflower Compact agreeing to abide by majority rule.
- The Massachusetts Bay Colony was formed in 1630 by Puritans led by John Winthrop who sought to establish an ideal religious community separate from the Church of England.
- The colonies grew rapidly in the 1630s during the Great Migration which saw over 20,000 English immigrants arrive in Massachusetts, and towns established self-governance through democratic institutions like town meetings.