What happened in 1620. Cite your source.

In 1620, the Pilgrims arrived in Plymouth, Massachusetts aboard the Mayflower and established the Plymouth Colony. This event is also commonly known as the Mayflower Compact.

Source: History.com, https://www.history.com/topics/colonial-america/mayflower-compact#targetText=The%20Mayflower%20Compact%20was%20signed,colony%20in%20what%20is%20today.