More information about Republic of the Congo is available on the Republic of the Congo page and from other Department of State publications and other sources listed at the end of this fact sheet. U.S.-REPUBLIC OF THE CONGO RELATIONS.The United States established diplomatic relations with the Republic of the Congo in 1960, following the country's independence from France. Diplomatic relations were suspended in 1965, then resumed in 1977.he country, then the Peopleâs Republic of the Congo, had a Marxist government from 1970 to 1991 and enjoyed close relations with the Soviet Union, Cuba, and China, while maintaining strong economic ties with France.