The French and Spanish established colonies in Florida, Louisiana, and Texas. The Spanish colonized Florida in the 16th century, with their communities reaching a peak in the late 17th century. In the British and French colonies, most colonists arrived after 1700. They cleared land, built houses and outbuildings, and worked on the large plantations that dominated export agriculture. Many were involved in the labor-intensive cultivation of tobacco, the first cash crop of Virginia. With a decrease in the number of British willing to go to the colonies in the eighteenth century, planters began importing more enslaved Africans, who became the predominant labor force on the plantations. Tobacco exhausted the soil quickly, requiring new fields to be cleared on a regular basis. Old fields were used as pasture and for crops such as corn and wheat, or allowed to grow into woodlots.