Explanation:
In the late 1800s, people in many parts of the world decided to leave their homes and immigrate to the United States. Fleeing crop failure, land and job shortages, rising taxes, and famine, many came to the U. S. because it was perceived as the land of economic opportunity.
It was invented in 1950. They started to work on it in 1930 I beleive.
Cant answer without seeing page 219, but propaganda is bascially biased information used to support someone elses views