How did cotton exports add to the growing issue of slavery?

What will not cause political parties to change or develop

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.

Which of the following did the maya, aztec, and inca all have in common