The Massachusetts Bay Colony was not larger than present-day Massachusetts. When it was founded in 1628, the colonial land grant extended from the Atlantic to the Pacific but it only stretched north to just beyond present day New Hampshire. In 1691 the Massachusetts Bay Colony charter was replaced by The Province of Massachusetts Bay and its western border would change depending on who held neighboring colony charters during colonial America and for the first few dozen years of the United States until, in 1820, Maine would separate from Massachusetts when The State of Maine joined the Union while western land claims were given up as early as the Treaty of Hartford but all claims were abandoned when Massachusetts ratified Article 5 the Treaty of Paris (1783).