 In the vertical perspective (social-class relations) of Marxism–Leninism, the internal and international affairs of a country are a political continuum, not separate realms of human activity.This is the philosophic opposite of the horizontal perspectives (country-to-country) of the liberal and the realist approaches to international relations.Colonial imperialism is the inevitable consequence in the course of economic relations among countries when the domestic price-fixing of monopoly capitalism has voided profitable competition in the capitalist homeland.