What changes of the war create on the international stage

How did the technology of the late 1800s affect the growth of cities? select one: a. cities were able to expand outward because of additions to railroads. b. electric streetcars enabled the wealthy city dwellers to move to the first suburbs. c. advances in steel and metal technology allowed for the development of the skyscraper, which allowed cities to grow upwards. d. all of these are correct.

How does the balance of trade look different in the us today vs hot it looked in the 70's

Why did lee feel like he needed to join general johnston in north carolina?