Cities were able to expand their geographic areas in the late 19th century because of the development of a. mass transit. b. settlement houses. c. skyscrapers. d. assembly lines.

u.s. presidents buried at arlington national cemetery include john f. kennedy and william howard taft. the kennedy gravesite is the final resting place not only of the former president, but also his wife jackie kennedy, his two brothers robert and edward kennedy, as well as a memorial to his brother joe jr.good luck

explanation:

i believe your answer is mountains.

answer; regard the action of other people negatively;

answer; all of the answers are correct;