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.
During the Cold war, there was a big fear of a possible nuclear attack from the Soviet Union, so when the US wanted to increase its spending on defense, it argued for it by saying that it needed to have better weapons to be able to prevent a possible attack.
Explanation:
The passive voice is a verbal construction in some languages for which is presented to the subject as passive, while action taken by the verb is performed by a complement and not by the subject agent the verb in active voice.
Answer:
What replaces steam? What new power source was developed in the late 1800s? In the late 1800s, a new power source—electricity—replaced steam as the dominant source of industrial power.
