When one closes off an area to stop people or goods from entering or leaving a place this means that an embargo on goods is present. This is usually done when one doesn't want a nation to continue its economic relationship with other nations. When people are stopped from entering or leaving a place, this would mean that they are put under quarantine.
True, they also would have a trading system
Answer:
C. The first group of African American pilots in the U.S. Military
Explanation:
