Which effect of industrialization made city centers somewhat unpleasant for residents?

Why was mao zedong’s communist china ready to use military tactics against the troops of us general douglas macarthur in korea? a. mao zedong had long planned to declare war against the united states. b. us troops kept marching farther into north korea, getting closer to the chinese border. c. us president harry truman threatened to use nuclear weapons against china. d. kim il sung had requested china’s to declare war against the united states.

According to nationalists, a nation-states government should be a. controlled by european monarchs b. led by an appointment president c. voted on by european parliaments d. chosen by that nation-state

What directive in source a might have been at the root of the action described in source b?