Answer:
Two days after sealing off free passage between East and West Berlin with barbed wire, East German authorities begin building a wall—the Berlin Wall—to permanently close off access to the West.
Answer: economic growth and increased urbanization
Explanation: The result of new technologies in the Gilded age led to economic growth and increased urbanization / growth of cities.
I'm not 100% sure but it could be: Voluntary Exchange takes place between buyers and sellers:
(btw I copied and pasted from the question so I didn't take any content :D)
Many of the arguments that favor internal improvements financed by the government center around economic development as a result of government spending as well as the fact that infrastructure and internal improvements are public goods which will largely not be paid for by the private sector. The arguments against it are that the government shouldn't finance these projects because the market will account for it somehow. Most individuals even if they are against government spending believe that the government should be responsible for infrastructure projects.
