Generally speaking, in towns such as New York and Cleveland and Chicago blacks were heavily discriminated against and forced to live in segregated and discriminatory housing projects.
They sided with the North. Unless they were Southern slaves already, they fought for the North.
This is because the North was partially fighting for their freedom!
I hope this helps! :)
The domino theory was a theory prominent from the 1950s to the 1980s that posited that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.
A domino effect or chain reaction is the cumulative effect produced when one event sets off a chain of similar events. The term is best known as a mechanical effect and is used as an analogy to a falling row of dominoes.
So the answer is the last one, “<u>It was the idea that if one nation fell to communism, others would soon follow the example</u>.”