The correct response is:
The Pilgrims' successful establishment of Plymouth Colony contributed to the idea of self-governance and the Mayflower Compact served as an early example of democratic principles.
The Pilgrims' arrival in America and the signing of the Mayflower Compact in 1620 laid an important foundation for self-government and democracy in what would become the United States. The Compact established a framework for governance and social order based on mutual consent, which influenced future democratic practices.