What caused a change in urban demographics after 1919?

a. The Second Great Migration which drew African Americans to urban areas occurred.
b. European immigration increased; factory jobs were filled.
c. The Bracero program drew Native Americans to cities.
d. Many people left and moved to the suburbs.

that is probably something for you to answer

the neolithic revolution began the era of permanent societies, the reliance on the limited amount of land gave way to political organization and this political organization caused social organization which was divided by amount of property and power.

the neolithic revolution (new stone age) was the first agricultural revolution. it was a gradual change from nomadic hunting and gathering communities and bands to agriculture and settlement. this period is described as a "revolution" because it changed the way of life of communities which made the change.

sentence:

let´s farm and domesticate these animals so we do not be hunting in the woods all the time