The major political ideology showcased in "The Communist Manifesto," written by Karl Marx and Friedrich Engels in 1848, is communism. The manifesto outlines the struggles between the bourgeoisie (capitalist class) and the proletariat (working class), arguing for the overthrow of capitalist systems and the establishment of a classless society. It emphasizes collective ownership of the means of production, abolishing private property, and promoting social equality. The "Communist Manifesto" became a foundational text for communist movements worldwide, influencing political thought and revolution in various countries.