Carolina, South Carolina, and Georgia were crown colonies. Massachusetts became a crown colony at the end of the 17th century. Proprietary colonies were governed much as royal colonies, except that lord proprietors appointed the governor rather than the king. They were set up after the English Restoration of 1660 and typically enjoyed greater civil and religious liberty. Pennsylvania (which included Delaware), New Jersey, and Maryland were proprietary colonies. Charter governments were political corporations created by letters patent, giving the grantees control of the land and the powers of legislative government. The charters provided a fundamental constitution and divided powers among legislative, executive, and judicial functions, with those powers being vested in officials. Massachusetts, Providence Plantation, Rhode Island, Warwick, and Connecticut were charter colonies. The Massachusetts charter was revoked in 1684 and was replaced by a provincial charter that was issued in 1691. Providence Plantations merged with the settlements at Rhode Island and Warwick to form the Colony of Rhode Island and Providence Plantations, which also became a charter colony in 1636. British role After 1680, the imperial government in London took an increasing interest in the affairs of the colonies, which were growing rapidly in population and wealth. In 1680, only Virginia was a royal colony; by 1720, half were under the control of royal governors. These governors were appointees closely tied to the government in London. Historians before the 1880s emphasized American nationalism. However, scholarship after that time was heavily influenced by the "Imperial school" led by Herbert L. Osgood, George Louis Beer, Charles McLean Andrews, and Lawrence H. Gipson. This viewpoint dominated colonial historiography into the 1940s, and they emphasized and often praised the attention that London gave to all the colonies. In this view, there was never a threat (before the 1770s) that any colony would revolt or seek independence. Self-government British settlers did not come to the American colonies with the intention of creating a democratic system; yet they quickly created a broad electorate without a land-owning aristocracy, along with a pattern of free elections which put a strong emphasis on voter participation. The colonies offered a much freer degree of suffrage than Britain or indeed any other country. Any property owner could vote for members of the lower house of the legislature, and they could even vote for the governor in Connecticut and Rhode Island. Voters were required to hold an "interest" in society; as