The growth of the service economy caused
a. an increase in american blue-collar jobs.
b. a decrease in new small businesses.
c. an increase in worldwide average wages.
d. a decline in u. s. union membership.

The correct answer is D) a decline in U.S. union membership.

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when world war i broke out across europe in 1914, president woodrow wilson proclaimed the united states would remain neutral, and many americans supported this policy of nonintervention. however, public opinion about neutrality started to change after the sinking of the british ocean liner lusitania by a german u-boat in 1915; almost 2,000 people perished, including 128 americans. along with news of the zimmerman telegram threatening an alliance between germany and mexico, wilson asked congress for a declaration of war against germany. the u.s. officially entered the conflict on april 6, 1917.