1. Why did people originally start living together on the Mesopotamian plains? They had to work together to provide enough water to make crops successful.
They enjoyed each other's company.
The had to protect each other from invaders.
They produced so much food that they needed extra help to harvest it all.

Explanation: One reason why people settled here is because the soil is very fertile. When snow melted in the mountains, there were yearly floods. The floods deposited silt, which made the land very fertile. The Sumerians were the first people to settle in this region.

c. free trade can lead to low pay for workers in poorer countries.