Karl marx believed that was the central force for social change, while max weber believed that was the force most responsible for social change.

Karl marx believed that economics was the central force for social change, while max weber believed that religion was the force most responsible for social change.

Primary sources are usually  more accurate and are written by someone who experienced it or witnessed it. secondary sources are those who heard of it after the fact that can lose details and or twist the event in a light that benefits them.

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