What role did spain, france, and the netherlands play during the american revolution?

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.

Which statement best explains how the invention of corporations contributed to the economy in the 1800's

At the beginning of the war, why was hitler allowed to continue his aggression without resistance from other european countries