In 1954, the supreme court case brown v. board of education

overturned plessy v. ferguson by ruling segregation unconstitutional.

stated that african american and white schools needed to be equal.

upheld the separate car act by ruling that segregation was legal.

upheld plessy v. ferguson by ruling segregation constitutional.

stated that African American and white schools needed to be equal.

Explanation:

The court agreed that racial segregation in public schools violates the Fourteenth Amendment to the Constitution, revised the decision of 1896 and thereby opened the way for desegregation not only in schools, but also in public institutions.

becasue in the south they disallowed slavery but in the north slavery was illegial this boilled into because mexico wanted slavery

the mongolian invasion of china and central asia resulted in a disruption of the silk road as the chinese garrisons lost support from the chinese kingdoms which fell under the mongols. however, as the mongols established a formal dynasty in china, the successors of genghis khan restored the garrisons along the silk road allowing the safe travel caravans again.