At Swaziland's independence on 6 September 1968, Swaziland adopted a Westminster-style constitution. On 12 April 1973, King Sobhuza II annulled it by decree, assuming supreme powers in all executive, judicial, and legislative matters. The first non-party elections for the House of Assembly were held in 1978, and they were conducted under the tinkhundla as electoral constituencies determined by the King, and established an Electoral Committee appointed by the King to supervise elections.