What were the two warring classes that marx and engels outlined in the communist manifesto?

The two warring classes of The Communist Manifesto are the bourgeoisie - the capitalists, or the owners of the means of production  and the working class, called the proletariat, which works for wages and does not (directly or personally) own the company they work for.

Contributing factors  leading  to the harlem renaissance were the great migration of african americans to northern cities, which concentratedambitious  people in places where they could encourage each  other, and the first world war, which had created new industrial work opportunities for tens of thousands of people.