Slavery in the colonial United States December 1865. 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
Mecklenburg Declaration of Independence though the Mecklenburg Declaration was supposedly written more than a year before the 1776 United States Declaration of Independence, the two declarations had some very similar phrases, including "dissolve the political bands which have connected", "absolve ourselves from all allegiance to the British Crown", "are, and of right ought to be", and "pledge to each other, our mutual cooperation, our lives, our fortunes, and our most sacred honor". This raised an obvious question: did Thomas Jefferson, the principal author of the American Declaration of Independence, use the Mecklenburg Declaration as a source? One person who thought so was John Adams,