What was this structure intended to accomplish? A) to provide a trade route for merchants to move goods to Europe
B) to prevent invasion of nomads across the northern frontier of China
C) to end a series of civil wars between rival dynasties
D) to create a faster and more efficient way of traveling across the mountains

Which effect did the united states supreme court's decision in plessy v. ferguson have? 1. ending segregation in all public schools in america 2. protecting voting rights for african americans by eliminating literacy tests 3. upholding the rights of all citizens to be treated equally by the government 4. authorizing the system that kept black and white people separated