Congo benefited from the postwar expansion of colonial administrative and infrastructure spending as a result of its central geographic location within AEF and the federal capital at Brazzaville. It also received a local legislature after the adoption of the 1946 constitution that established the Fourth Republic.
Following the revision of the French constitution that established the Fifth Republic in 1958, the AEF was dissolved and its constituent parts reformed into autonomous colonies within the French Community. During these reforms, Middle Congo became known as the Republic of the Congo in 1958 and published its first constitution in 1959. Antagonism between the pro-Opangault Mbochis and the pro-Youlou Balalis resulted in a series of riots in Brazzaville in February 1959, which had to be subdued by the French army.
The Republic of the Congo was granted full independence from France on August 15, 1960. Fulbert Youlou ruled as the country's first president until labour elements and rival political parties instigated a three-day uprising that ousted him. The Congolese military took charge of the country briefly and installed a civilian provisional government headed by Alphonse Massamba-Débat. Under the 1963 constitution, Massamba-Débat was elected President for a five-year term. The regime adopted "scientific socialism" as the country's constitutional ideology.
In 1965, Congo established relations with the Soviet Union, the People's Republic of China, North Korea and North Vietnam. Massamba-Débat was unable to reconcile various institutional and ideological factions and his regime ended abruptly with an August 1968 coup d'état. Marien Ngouabi, who had participated in the coup, assumed the presidency on December 31, 1968. One year later, President Ngouabi proclaimed Congo to be Africa's first "people's republic" and announced the decision of the National Revolutionary Movement to change its name to the Congolese Labour Party (PCT)
