What European colonial power did Tanzania gain independence from in 1961?

Tanzania did not gain independence from a European colonial power in 1961. It gained independence from the United Kingdom in 1961, but Tanganyika and Zanzibar were separate countries at that time. Tanganyika gained independence on December 9, 1961, and Zanzibar on December 10, 1963. The two countries united on April 26, 1964, to form Tanzania.