Original: Following the ratification on 26 April 1964 of the Articles of Union between Tanganyika and Zanzibar , the two states merged to form the United Republic of Tanganyika and Zanzibar , which continued as a single member ; it changed its name to the United Republic of Tanzania on 1 November 1964 .
Simplified: After the ratification on 26 April 1964 of Articles of Union between Tanganyika and Zanzibar , the United Republic of Tanganyika and Zanzibar continued as a single Member , changing its name to the United Republic of Tanzania on 1 November 1964 .