Why did the united states get pulled into world war i?
a. germany owed the united states money for war supplies.
b. mexico attacked the united states.
c. the united states was shown a letter from germany encouraging mexico to invade america.

The service industry in the united states grew in the late 1800s. what was one effect of that growth? the number of people with jobs in factories as unskilled workers decreased. the number of people with jobs in factories as unskilled workers increased. the middle class grew as people took jobs as clerks, lawyers, and teachers. the middle class shrank as people left jobs as clerks, lawyers, and teachers.