Your challenge is to allow the colony of Plymouth to survive until the present-day. How does this happen? What effect does this have on New England politics? Does the American Revolution still happen? A quick google search tells me that a state of Plymouth would have about 1.3 million people, still more than Rhode Island, Delaware, Montana, Alaska, North Dakota, DC, Vermont, and Wyoming. Also, would the town of Plymouth still be the capital, given that other towns like Brockton have more people?