What significant document did the Pilgrims sign in 1620?

The significant document that the Pilgrims signed in 1620 is the Mayflower Compact. This agreement was created aboard the Mayflower, the ship that brought the Pilgrims to America, as they recognized the need for a governing body to maintain order and establish a functioning society in their new settlement. The Mayflower Compact was important because it laid the foundation for self-governance and majority rule, illustrating the early principles of democracy in America. The signers pledged to work together for the good of their colony, marking an early step in the development of democratic governance in the United States. This document is often considered a critical precursor to later American democratic principles found in documents such as the Constitution and the Bill of Rights, but it predates both of those by over a century.