Throughout the Antebellum Period, Charleston continued to be the only major American city with a majority-slave population. The city widespread use of slaves as workers was a frequent subject of writers and visitors: a merchant from Liverpool noted in 1834 that "almost all the working population are Negroes, all the servants, the carmen & porters, all the people who see at the stalls in Market, and most of the Journeymen in trades". American traders had been prohibited from equipping the Atlantic slave trade in 1794 and all importation of slaves was banned in 1808, but American ships long refused to permit British inspection, and smuggling remained common. Much more important was the domestic slave trade, which boomed as the Deep South was developed in new cotton plantations. As a result of the trade, there was a forced migration of more than one million slaves from the Upper South to the Lower South in the antebellum years. During the early 19th century, the first dedicated slave markets were founded in Charleston, mostly near Chalmers and State streets. Many domestic slavers used Charleston as a port in what was called the coastwise trade, traveling to such ports as Mobile and New Orleans.