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Britain's 13 North American colonies experienced an extraordinary rate of population growth. In 1700 the population was about 250,000; seven decades later there were about 2,500,000 inhabitants, a tenfold increase. This phenomenal growth was a prerequisite for a successful independence movement. In 1700 there were 20 people in Britain for every American colonist; by 1775 this ratio had fallen to 3 to 1.

The American population also changed in composition. The proportion of the colonists who were of English culture and ancestry steadily declined during the 1700s as the result of the arrival, by forced or voluntary migration, of new racial and ethnic groups. Among the 80 percent of Americans who were of European descent, there were important cultural divisions. Migrants from Germany, Scotland, and Ireland made up at least 30 percent of the white population. Members of these groups often settled in their own communities, especially in the mid-Atlantic colonies of Delaware, New York, New Jersey, and Pennsylvania. Others migrated into the backcountry regions of the Southern colonies (Maryland, Virginia, North Carolina, South Carolina, and Georgia), thus adding ethnic diversity to a region already divided along racial lines. Only the New England colonies of Connecticut, Rhode Island, Massachusetts, and New Hampshire remained predominantly English in composition and culture.

In 1775 about one-fifth of the people of the mainland colonies were of African ancestry. Unlike Latin America and the West Indies, North American slaves had a high rate of natural increase. About 250,000 Africans were brought to the mainland colonies before 1775, but the total black population numbered 567,000 on the eve of independence. Most lived as slaves working on tobacco and rice plantations in the Southern colonies. Slaves and some free blacks also lived in the Northern colonies, working on small farms or in cities.

Diversity existed not only in the population but also in religious life. Many of the American colonists were not members of any church. Of those who had a religious affiliation, the vast majority were Protestant Christians. There were significant numbers of Roman Catholics in Maryland and Delaware, and a small number of Jews, mostly in Rhode Island. Among the Protestants, there were significant regional variations. In New England, the Congregational Church was legally established; all residents had to contribute to its support. In the South, the Church of England likewise received state support. However, Scots-Irish migrants created Presbyterian churches in the Southern backcountry. In addition, many Baptist congregations were formed during the Great Awakening, an important religious revival that swept through all the colonies during the 1740s. In the mid-Atlantic colonies, there were many different faiths, including Quakers, Dutch Reformed, Mennonites, Anglicans, Presbyterians, and Lutherans, so that it was difficult to enforce support for a single established church.

This growth in population and diversity made the American colonies more difficult for Britain to rule. It was therefore an important precondition for the rise of an independence movement and the subsequent emergence of a unique American nationality.

THE 13 COLONIES BEFORE 1763