The correct answer is "A: The Great Migration".
The Great Migration was the relocation of more the 6 million African Americans from the rural and urban areas of Southeastern United States (the states of the former Confederacy) to urbanized locations in the northeast, midwest, and west of the country. This dramatically changed the population distribution of African Americans, as 90% of their total population lived in the Southeast prior to this policy but when it ended 50% would live in the designed areas for relocation.
The correct answer is B.
Clinton v. New York was a decision enacted by the US Supreme Court in 1998, which stated that the line-item veto violated the Presentment Clause and, therefore, the US Constitution.
The line-item veto had been introduced by the Line Item Veto Act in 1996 and it allowed the chief of the executive power, the President, to veto fragments or provisions of a bill without vetoing the entire bill. In opposition, the Presentment Clause describes the procedure through which bills originating in Congress, become federal US law. Such procedures only contemplate the president's power or rejecting an entire bill.
The fact that the leaders of the Argentina kidnapped, ignored, threatened, and deported them best describe what the military leaders in Argentina did to the people who are willing and has the guts to disagree to whatever their policies are.
After the World War II and all of the terrors witnessed through it on ethnic and racial basis, the international community was determined that something like that should never happen again, and that all humans are equal and deserve the same rights.
That benefited the African American population in the United States a lot, as they now had the basis and support with which they were able to push through to gain all of the rights they deserve, thus be equal with all of the rest. That led to the formation of multiple organizations for the rights of the African Americans, widespread propaganda, protests, and eventually it gave a positive result, with the African Americans gaining all of the rights they deserved, but also putting the racism aside in the American society.