The three political ideologies that struggled for world supremacy in the first half of the twentieth century

communism, fascism, and capitalism.

Explanation:

Twentieth-century witnessed the ideological struggle between three major political ideologies that are mentioned below:

Communism is a political theory that was derived from Karl Marx. Its goal is to establish a communist society based on the idea of common ownership of means of production. It is an ideology of economic equality and elimination of private property hence the social classes are absent in communist society. Fascism is a form of authoritarian ultra-nationalism. Dictatorship, strong segmentation of society. It came to prominence in the early twentieth century. Capitalism: An Economic system in which companies and people make most of their decision and there is no government interference. Means of production is privately owned in capitalist societies and operates for profit maximization.