Black Bermudians became highly skilled shipwrights, blacksmiths and joiners. Many of the shipwrights who helped to develop shipbuilding in the American South, especially on the Virginia shore of the Chesapeake (Bermuda, also known as "Virgineola", had once been part of Virginia, and had maintained close connections ever since), were black Bermudian slaves, and the design and success of the area's schooners owes something to them, also. Due to the large number of white Bermudian men who were away at sea at any one time (and possibly due as much to fear of the larger number of enslaved black Bermudian men left behind) it was mandated that blacks must make up a percentage of the crew of every Bermudian vessel. By the American War of Independence, the use of many able black slaves as sailors added considerably to the power of the Bermudian merchant fleet due to their highly needed skill set, and these included the crews of Bermudian privateers. When the Americans captured the Bermudian privateer "Regulator", they discovered that virtually all of her crew were black slaves. Authorities in Boston offered these men their freedom, but nearly all of the 70 captives elected to be treated as prisoners of war, claiming slavery was all they knew and out of fear for their families who were still in Bermuda. Sent to New York on the sloop "Duxbury", those who were left seized the vessel and sailed it back to Bermuda. Slavery was not abolished in Bermuda until ordered by the British Government in 1834, the Royal Navy had already made frequent use of Bermuda sloops in suppressing the trans-Atlantic slave trade (having formed the West Africa Squadron to this end in 1808, following passage of the Slave Trade Act 1807). The term "Bermuda sloop" was also to describe the working boats historically used for moving freight about Bermuda's islands, for fishing, and other coastal activities, and today is used to designate any single-masted yacht with Bermuda rig. Motor vehicles were banned in Bermuda until after the Second World War, and the roads were few and poor until the requirements of that war advanced their development. Boats, as a consequence, remained the primary method of moving people and materials around Bermuda well into the 20th century. Although such small sloops are rare today, the design was further scaled down to produce the Bermuda Fitted Dinghy, a class of racing vessel used in traditional competition between Bermudian yacht clubs.