Answer:
They had a surplus of food, they divided labor and built cities.
After the development of the irrigation systems, they could grow more wheat and that meant more food for the growth of the population.
They divided labor between themselves. Who will harvest crops, who will tend to the irrigation systems, who will tend to fields. They had a lot of other workers such as carpenters or soldiers and that means that they knew how to divide labor between the population.
They started to build cities so they could work together, trade, store food, and the cities grew as more and more people came to live there.
The primary goal of the United Nations would be to "<span>d. promote peace, security, and cooperation among countries of the world," since it was created immediately after World War II in the hopes of averting another major crisis. </span>
The First Continental Congress helped unite the separate colonies
