Why were towns built along the Great Wall

According to this chart, which country is likely to have the most economic freedom with regards to entrepreneurship?

How does sociology account for the cause of drug and alcohol addiction?

The 6th amendment's guarantee of a speedy and public trial is aimed at a. deterring potential criminals by fear of swift and certain punishment. b. trying those accused of crimes without undue delay and avoiding secret trials. c. eliminating overcrowded dockets in the nation's criminal courts. d. preventing jurors from being unduly influenced by public opinion.