During the early seventeenth century, religious conflict in England continued driving migration to North America. Among the most influential groups were the Puritans, English Protestants who sought to reform and purify the Church of England according to stricter religious principles. Unlike the Pilgrims, who separated completely from the Church of England, most Puritans initially hoped to reform the church from within.

Political and religious tensions intensified during the reigns of James I and Charles I as English authorities increased pressure on dissenting religious groups. Many Puritans viewed the New World as an opportunity to establish communities organized around their religious beliefs and social ideals.

In 1630, a large Puritan migration led by John Winthrop established the Massachusetts Bay Colony. Unlike the smaller Plymouth settlement, Massachusetts Bay rapidly expanded into one of the most influential and populous colonies in New England. Winthrop described the colony as a "city upon a hill," a society intended to serve as a moral and religious example for others.

Puritan communities placed strong emphasis upon religion, family structure, discipline, education, and communal responsibility. Church membership often influenced political participation and social status within colonial society. Local governments and religious institutions became closely connected throughout much of New England.

Education held unusual importance within Puritan communities because many settlers believed individuals should be able to read the Bible for themselves. Schools became more common in New England than in many other colonies, and in 1636 the colony established Harvard College to train ministers and civic leaders.

Despite their own experiences with religious persecution in England, Puritan colonies often enforced strict religious conformity within their settlements. Dissenters who challenged Puritan authority or doctrine sometimes faced punishment, exile, or persecution. Figures such as Roger Williams and Anne Hutchinson were expelled from Massachusetts Bay after criticizing colonial religious leadership and advocating greater religious freedom.

These conflicts contributed to the founding of additional colonies. Roger Williams established Rhode Island as a refuge supporting greater religious tolerance and separation between church and government. Other colonies throughout New England gradually developed distinct political and religious identities despite shared cultural roots.

Relations between Puritan settlers and indigenous populations became increasingly strained as colonial expansion accelerated. Growing demand for land and resources contributed to repeated conflicts throughout New England during the seventeenth century. One of the bloodiest of these conflicts, King Philip's War from 1675 to 1676, devastated both indigenous communities and colonial settlements across the region.

New England developed differently from the plantation economies of the southern colonies. Smaller farms, fishing, shipbuilding, trade, and maritime commerce became central to the region's economy. Town meetings and local assemblies also encouraged traditions of political participation and self-government that would later influence revolutionary ideas in colonial America.

The Puritan colonies helped shape many enduring characteristics of early American society, including the importance of education, local government, religious influence, and communal identity. At the same time, they also revealed tensions between ideals of liberty and the realities of religious conformity, exclusion, and colonial expansion that would continue throughout American history.