In this quote, Thurgood Marshall is talking about the time between the signing of the Emancipation Proclamation (which was supposed to free slaves in the Confederacy) to the Brown vs. Board case which ruled that "separate but equal" is unconstitutional.
The reason he brings up these two events is because it shows how little progress American society has changed in these 90 years. Even though African-Americans were supposed to be free citizens after the Emancipation Proclamation, they were still treated as second class citizens in the US. They were constantly targets of voter discrimination, violence, and prejudice.
Answer: Claim
This is an example of a "claim." A claim is an assertion that states that something is the case, or that something is a fact. It is typically provided regarding a situation that is in dispute. In this case, most people would argue that time will help us reach the solution to our problems. The speaker is disputing this assumption, by saying that the solution is in our hands.
Q:
Which of the following is a successful result of result of the reconstruction?
A:
More African Americans could go to school.
Hope I helped!