The period of revolutions in the 1950s, 1960s and 1970s where military leaders revolted against colonial rule in asia, africa and latin america was known as what?

The Cold War (1945–1991) was the continuing state of political conflict, military tension, and economic competition between the Soviet Union and its satellite states, and the powers of the Western world, led by the United States. Although the primary participants' military forces never officially clashed directly, they expressed the conflict through military coalitions, strategic conventional force deployments, a nuclear arms race, espionage, proxy wars, propaganda, and technological competition, e.g., the space race.[1] The first use of the term to describe the specific post-war geopolitical confrontation between the USSR and the United States came in a speech by Bernard Baruch, an influential advisor to Democratic presidents,[1] The speech, written by journalist Herbert Bayard Swope,[2] proclaimed, "Let us not be deceived: we are today in the midst of a cold war.

Democracy and darwinism would be my answer.