Answer: A. Riots
Explanation: The King-assassination riots, also known as the Holy Week Uprising, was a wave of civil disturbance which swept the United States following the assassination of Martin Luther King Jr. on April 4, 1968.
Answer:
Before, the united states was known as a nation of immigrants, but now, there is demographics and political power of new americans.
Vietnam War is definitely one I'm not sure about the other two though