Very little is known about the early history of what is now Nagaland. British rule was established over the area by the 1890s, and headhunting, then a traditional practice, was outlawed. The Naga territory remained split between Assam and the North East Frontier Agency after Indian independence in 1947, despite a vocal movement advocating the political union of all the Naga tribes; one faction called for secession from India. In 1957, following violent incidents, the Indian government established a single Naga administrative unit under Indian rule. The Naga people responded by refusing to pay their taxes and by conducting a campaign of sabotage. In 1960 the Indian government agreed to make Nagaland a self-governing state within India; the state was officially inaugurated in 1963.