According to Marx history was the struggle between the classes. What groups were in competition and why?

Apex plz i’m almost done if i get this all right

This is the belief that a nation must develop and maintain a strong military force in order to pursue and defend its national interests.

7. how did the early egyptians use the flooding of the nile river to their advantage? they diverted the water to flood their enemy's lands and destroy their crops. they created an easier way to travel to the mediterranean sea and the indian ocean. they established a new water-based athletic event for the ancient olympics in greece. they devised an innovative irrigation system, which created a surplus of food.