I believe the answer is:
The Affordability Of Cell Phone Service
The widespread availability of the Internet in homes
Before these two exist, it is difficult for people to obtain new information and contact other people in different regions. After the development, we could even easily contacted other people in different countries and the flow information could happen with one single touch from our hand
During the Civil War, African Americans tried to join the Union army of the north. They were told, "Keep out of this; this is a white man's war." Lincoln said that the war was to save the Union, not to end slavery. But after a year he changed his mind.
Answer: D. they were socially isolated
Explanation: Reliable researches have shown that adolescents who are socially isolated have higher risks of delinquency, in other words have higher risk of involving in violent behaviors. It should be noted though that adolescent strain are not the only cause of social isolation and social isolation are also not the only cause of delinquency in adolescent.
Unfortunately I don’t have the answer to that but my best advice is just to put historical facts and BOOM!! you’re done
