During the 1920s, the advent of radio and motion pictures both had the effect of o
A.
increasing American's interest in history and literature.
B.
increasing the ability of criminals to operate undetected.
C.
undermining the tendency of industry toward big business and mass production.
D.
unifying Americans in a national culture.

D. unifying Americans in a national culture.

federal power is further limited with a system of checks and balances that gives each branch of government a measure of power over the others.

explanation:

hilary clinton

explanation:

trump won the popular vote and ended up becoming the president in 2016 because of this and the electoral college.