The culture of Niger is marked by variation, evidence of the cultural crossroads which French colonialism formed into a unified state from the beginning of the 20th century. What is now Niger was created from four distinct cultural areas in the pre-colonial era: the Djerma dominated Niger River valley in the southwest; the northern periphery of Hausaland, made mostly of those states which had resisted the Sokoto Caliphate, and ranged along the long southern border with Nigeria; the Lake Chad basin and Kaouar in the far east, populated by Kanuri farmers and Toubou pastoralists who had once been part of the Kanem-Bornu Empire; and the Tuareg nomads of the Aïr Mountains and Saharan desert in the vast north. Each of these communities, along with smaller ethnic groups like the pastoral Wodaabe Fula, brought their own cultural traditions to the new state of Niger.