It seems to have been a gradual migration for the Reeders; from Rhode Island, to Newtown, NY, to Bucks County, PA. At least that is the way it was for my branch. John/Isaac/Joseph/Charles-Merrick/ . . . Bucks County became a kind of homeland for Reeders as they left, came back, left, came back, etc.
As a later edit, there are still many of my Reeder cousins living in nearby Delaware County, PA.