The ethnic composition of Trinidad and Tobago reflects a history of conquest and immigration. While the earliest inhabitants were of Amerindian heritage, the two dominant groups in the country are now those of South Asian and of African heritage. Indo-Trinidadian and Tobagonians make up the country's largest ethnic group (approximately 35.4%); they are primarily the descendants of indentured workers from South Asia (mostly from India), brought to replace freed African slaves who refused to continue working on the sugar plantations. Through cultural preservation many residents of Indian descent continue to maintain traditions from their ancestral homeland. Indo-Trinidadians reside primarily on Trinidad; as of the 2011 census only 2.5% of Tobago's population was of Indian descent.