8. how did city life change during the late eighteen hundreds and early nineteen-hundreds?
a. neighborhoods became more crowded .
b. improved sanitation slowed the spread of disease.
c. urban workers began to move to the suburbs.
d. standard of living fell as wages dropped.

answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

explanation: