When Trinidad was explored by Columbus in 1498, it was inhabited by the Arawaks; Carib Indians inhabited Tobago. Trinidad remained in Spanish possession, despite raids by other European nations, until it was ceded to Britain in 1802. Tobago passed between Britain and France several times, but it was ultimately given to Britain in 1814. Slavery was abolished in 1834. Between 1845 and 1917, thousands of indentured workers were brought from India to work on sugarcane plantations. In 1889 Trinidad and Tobago were made a single colony.