Karl marx's communist manifesto is based on the perspective.

Conflict Theory, is the right answer.

Explanation:

Karl Marx and Friedrich Engels, the philosophers from Germany, in the year 1848 issued a political pamphlet, most popularly known as the Communist Manifesto. Originally published in London, this document was accredited by the Communist League. Based on the Conflict Theory, this Manifesto has been regarded as one of the most influential political documents of the world.

these civilizations were located around fertile rivers, where they could produce an abundance of crops