How did most investors react to a sudden fall in stock price in 1929? a: they called in their loans. b: they pooled money to buy stocks. c: they raced to sell their stocks d: they plegded their stocks as collateral.

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.