From an international perspective, that is to say, international trends and situations; Class contradiction is the contradiction between opposing classes. For example, in feudal society, landlords and peasants were antagonistic, while in bourgeois society, proletariat and bourgeoisie were antagonistic. When two opposing classes disagree, it is a class contradiction. Political crisis means that the ruling institutions of a country are unstable and disunited.

My method is to read more history books.