After World War II, Dar es Salaam had a period of rapid growth. Tanganyika became independent from colonial rule in December 1961. Dar es Salaam continued to be its capital. It remained the capital when in 1964 Tanganyika and Zanzibar merged to form Tanzania. However, in 1973, it was decided to move the capital to Dodoma. This has not yet been completed, and Dar es Salaam is still Tanzania's primary city.