um so im not sure what the answer is cos im doing the same test rn but the question is asking for your opinion on what u think it means so they probably wont count it as incorrect as long as its on topic and makes sense :)
The Civil War was from 1861-1865 which is 4 years.
By not being a social activist. Forcibly pushing an agenda to "change" the views of the people always results in discrimination, hate, and violence. The best way to achieve social change is on a personal level. Forget what is going on the world around you because you cannot change the views of the people around you, you can only change your own views. If you act as an tolerable individual, as a good person, and as a person who believes in treating people as human beings, you will create more of a positive effect than these so called "peaceful" protestors who think it is okay to shut down businesses, institutions, and parades in order to make a point.
People would denounce each other in fear or in suspicion that the person they were denouncing was a communist, socialist or anarchist.