Slavery in the colonial United States Slavery in the colonial United States Slavery in the colonial area which later became the United States (1600–1776) developed from complex factors, and researchers have proposed several theories to explain the development of the institution of slavery and of the slave trade. Slavery strongly correlated with Europe's American colonies' need for labor, especially for the labor-intensive plantation economies of the sugar colonies in the Caribbean, operated by Great Britain, France, Spain, and the Dutch Republic. Most slaves who were brought or kidnapped to the Thirteen British colonies - the Eastern seaboard of what later became the United States - were
United States Declaration of Independence a means to present a distinctly American political identity, thereby stimulating public debate on a topic that few had previously dared to openly discuss, and public support for separation from Great Britain steadily increased after its publication. Some colonists still held out hope for reconciliation, but developments in early 1776 further strengthened public support for independence. In February 1776, colonists learned of Parliament's passage of the Prohibitory Act, which established a blockade of American ports and declared American ships to be enemy vessels. John Adams, a strong supporter of independence, believed that Parliament had effectively declared American independence before Congress