According to rousseau how does the social contract work

He u.s. constitution (1787) establishes a national legislature with powers to “create national law”, a national executive with the power to “enforce national law”, and a national judiciary branch with the power to “interpret national and state policies” to see whether or not they violate the national constitution. this term describes the division of governmental authority into semi-independent bodies?

Explain how social darwinism impact imperialism.

The information box says that the han added 4,000 miles of wall.refer to the mileage scale.how can this be true?