After completing his studies, Ntidendereza was made chief of Mutabo in 1943. From 1944 to 1960 he served as the chief of
Bwambarangwe. In 1950 he accompanied
Mwami Mwambutsa IV on his first trip to Europe. In 1954 he was made a member of the Supreme Land Council (
Conseil Supérieur du Pays, CSP), The PDC's main rival was the
Union for National Progress (
Union pour le Progres National, UPRONA) led by Prince
Louis Rwagasore, a Ganwa of the Bezi clan. The PDC, unlike UPRONA, rejected calls for immediate independence and instead focused its platform on socioeconomic reform. Despite ideological differences, the rivalries between the two parties were primarily fueled by the intra-nobility conflicts, as the Bezi and Batare lineages backed UPRONA and PDC respectively. The two lineages had long struggled for control of the country. One of Ntidendereza's other brothers,
Charles Baranyanka, joined UPRONA and became a diplomat. The Belgian administration channeled financial aid to Ntidendereza and the PDC, particularly on the initiative of Assistant Resident Pierre DeFay. In November 1960 Urundi hosted communal elections. Rwagasore was placed under house arrest, hampering UPRONA's campaign, and the PDC emerged as the victor, winning 942 of 2,876 local offices. Ntidendereza's and DeFay's relationship later deteriorated, as Ntidendereza sought to loosen his connections to the administration and act independently of its wishes. In May 1961 Ntidendereza replaced Brioli as PDC president. The administration created an interim government led by Prime Minister
Joseph Cimpaye based on the communal election results to lead the country until elections for the national legislature were held. On 6 July the government was modified and Ntidendereza was made Minister of Interior. For the
1961 legislative elections, UPRONA concentrated its entire election campaign on Rwagasore, using his charisma to rally substantial support. The PDC had assumed a certain victory due to its success during the November 1960 municipal elections and began its election campaign late. To oppose UPRONA it formed a
cartel with other parties, termed the
Common Front (
Front Commun). The elections were held on 18 September 1961. With approximately 80% voter turnout, UPRONA won 58 of 64 seats in the Legislative Assembly, and Rwagasore was declared prime minister designate. == Death ==