The Jamestown and Plymouth colonies experienced many difficulties in their early years. Jamestown settlers struggled with disease, attacks from Native Americans, and a lack of food. John Smith emerged as a strong leader who forced the colonists to work and build houses and plant crops. His leadership helped the colony survive, but conditions remained difficult. The cultivation of tobacco eventually boosted the Jamestown economy and led to the importation of indentured servants and African slaves to work the tobacco fields.