Final answer:
Marx maintained that class conflict arises from the emergence of property and the struggle for power between classes. In the capitalist stage of history, conflict exists between the bourgeoisie and the proletariat.
Step-by-step explanation:
Marx maintained that class conflict arises from the emergence of property. As each class strives to acquire property, one eventually overpowers and exploits the other. Historical progression is the outcome of class struggle, with revolutions occurring when the developing means of production create an imbalance. In the capitalist stage of history, conflict exists between the bourgeoisie (owners of the means of production) and the proletariat (laborers).