angola
After a successful military coup in Portugal that toppled a long-standing authoritarian regime on April 25, 1974, the new rulers in Lisbon sought to divest the country of its costly colonial empire. The impending independence of one of those colonies, Angola, led to the Angolan civil war that grew into a Cold War competition. The Angola crisis of 1974–1975 ultimately contributed to straining relations between the United States and the Soviet Union.