The boundaries of Rhode Island underwent numerous changes from early Colonial times well after American independence, including repeated disputes with Massachusetts and Connecticut who contested for control of territory that ultimately belonged to Rhode Island. Rhode Island's early compacts did not stipulate the boundary on the eastern shore of Narrangansett Bay, and did not include any of
Washington County, land that belonged to the
Narragansett people. The original settlements were at
Providence, Warwick, Newport, and Portsmouth, and the territory was expanded by purchasing land from the Narragansetts westward toward Connecticut and the smaller islands in Narrangasett Bay. Block Island was settled in 1637 after the Pequot War, became a part of the colony in 1664, and was incorporated in 1672 as
New Shoreham.
Western boundary defined the border between
Connecticut Colony and Rhode Island. The western boundary with
Connecticut Colony was defined ambiguously as the "Narragansett River" in the Connecticut charter, which was decided by arbitrators in 1663 to be the
Pawcatuck River from its mouth to the
Ashaway River mouth, from which a northward line was drawn to the Massachusetts line. This resolved a long-standing dispute concerning the former Narragansett lands which were also claimed by Connecticut and Massachusetts, although the dispute continued until 1703, when the arbitration award was upheld. After repeated surveys, a mutually agreeable line was defined and surveyed in 1728.
Eastern boundary The eastern boundary was an area of dispute with
Massachusetts Bay Colony. Overlapping charters had awarded an area extending three miles inland to both
Plymouth Colony and Rhode Island east of Narragansett Bay; this area was awarded to Rhode Island in 1741, establishing Rhode Island's jurisdiction over Barrington, Warren, Bristol, Tiverton, and Little Compton, which Massachusetts had claimed. Also adjudicated in the 1741 decision was the award of most of Cumberland to Rhode Island from Massachusetts. The final establishment of the boundaries north of Barrington and east of the Blackstone River occurred almost a century after American independence, requiring protracted litigation and multiple U.S. Supreme Court decisions. In the final decision, a portion of Tiverton was awarded to Massachusetts to become part of Fall River, and two-thirds of Seekonk (now eastern Pawtucket and East Providence) was awarded to Rhode Island in 1862.
Northern boundary Rhode Island's northern border with Massachusetts also underwent a number of changes. Massachusetts surveyed this line in 1642, but subsequent surveys by Massachusetts, Rhode Island, and Connecticut agreed that it was placed too far south. In 1718–1719, commissioners for Rhode Island and Massachusetts agreed on roughly that line anyway (except the section east of the Blackstone River, which remained disputed until 1741), and this is where the line remains today. ==Demographics==