How has this affected the modern world

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.

True or false: abraham lincoln delayed the emancipation proclamation to make sure the border states would stay loyal. *

What was the historic border between the united states and mexico?