During the presidential election of 2000, which states' voting system came under enormous scrutiny because of paper perforations known as chads?

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How did american entry into world war i affect the allied powers?

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.