little opportunity of survival on their own because of limited agricultural land and the lack of available credit to buy some. Hence, they continued to work on the plantations for nominal wages or lived in shantytowns and worked as occasional labourers. Sugar cane production remained the primary economy for over a century. During the 18th century, Antigua was used as the headquarters of the British Royal Navy Caribbean fleet. English Harbour Dockyard, as it came to be called, a sheltered and well-protected deepwater port, was the main base and facilities there were greatly expanded during the later 18th century. Admiral Horatio Nelson commanded the British fleet for much of this time, and made himself unpopular with local merchants by enforcing the Navigation Act, a British ruling that only British-registered ships could trade with British colonies. As the United States were no longer British colonies, the act posed a problem for merchants, who depended on trade with the fledgling country. As the main cash crop changed over the years, the main cash crops/products grown between 1953 and 1956 were cotton, sugar, meat, cereals, and local fruits and vegetables. Over time, the importance of crops and produce went into decline as other nations were able to sell goods at a price no longer feasible to sustain in the Antiguan economy. In more recent times, however, Antigua has developed a primarily service-based economy relying on tourism as their leading source of income. Much like other islands and nations that rely on tourism, this can become problematic as their success depends on the willingness of others to travel and explore the area. Moreover, this has tendency to follow a seasonal pattern leaving the country vulnerable at certain times in the year. Political development Along with most colonies of the British Empire, all slaves in Antigua were emancipated in 1833, but remained economically dependent upon the island's white plantation owners. Economic opportunities for the freed population were limited by a lack of surplus farming land, no access to credit and an economy built on agriculture rather than manufacturing. Poor labour conditions persisted until 1939 when a member of a British Crown commission urged the formation of a trade union movement. The Antigua Trades and Labour Union, formed shortly afterward, became the political vehicle for Sir Vere Cornwall Bird, who became the union's president in 1943. The Antigua Labour Party (ALP), formed by Bird and other