I believe the answer is: C a creation of a more national unified American trading economy
The core strategy behind the American system is to increase the tariff that imposed to foreign products when they enter united states. By doing this, Clay hoped to create a unified American trading by making it easier for local Small businesses to compete.
an Islamic center for learning that welcomed scholars from other countries
All of those are a part of Great Britain
Without the support of federal troops, segregation in the South lasted from the time of Reconstruction until 1964 and Civil rights Act, there was racial segregation in many counties in southern states till that year.
