Tennessee. Northerners also purchased slaves, though on a much smaller scale. Enslaved people outnumbered free whites in South Carolina from the early 1700s to the Civil War. An authoritarian political culture evolved to prevent slave rebellion and justify white slaveholding. Northern slaves typically dwelled in towns, rather than on plantations as in the South, and worked as artisans and artisans' assistants, sailors and longshoremen, and domestic servants. In 1672, King Charles II rechartered the Royal African Company (it had initially been set up in 1660), as an English monopoly for the African slave and commodities trade—thereafter in 1698, by statute, the English parliament opened the trade to all English subjects. The slave trade to the mid-Atlantic colonies increased substantially in the 1680s, and by 1710 the African population in Virginia had increased to 23,100 (42% of total); Maryland contained 8,000 Africans (23% of total). In the early 18th century, England passed Spain and Portugal to become the world's leading slave-trader. The North American royal colonies not only imported Africans but also captured Native Americans, impressing them into slavery. Many Native Americans were shipped as slaves to the Caribbean. Many of these slaves from the British colonies were able to escape by heading south, to the Spanish colony of Florida. There they were given their freedom if they declared their allegiance to the King of Spain and accepted the Catholic Church. In 1739 Fort Mose was established by African-American freedmen and became the northern defense post for St. Augustine. In 1740, English forces attacked and destroyed the fort, which was rebuilt in 1752. Because Fort Mose became a haven for escaped slaves from the English colonies to the north, it is considered a precursor site of the Underground Railroad. Chattel slavery developed in British North America before the full legal apparatus that supported slavery did. During the late 17th century and early 18th century, harsh new slave codes limited the rights of African slaves and cut off their avenues to freedom. The first full-scale slave code in British North America was South Carolina's (1696), which was modeled on the colonial Barbados slave code of 1661. It was updated and expanded regularly throughout the 18th century. A 1691 Virginia law prohibited slaveholders from emancipating slaves unless they paid for the freedmen's transportation out of Virginia. Virginia criminalized interracial marriage in 1691, and subsequent laws abolished free blacks' rights to vote, hold office,