At the end of the American Revolution, Great Britain gave up territory east of the Mississippi River.
kept territory east of the Mississippi River.
took control of the Mississippi River.
denied the colonies their independence.

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:

the answer is d. selective incorporation. (apex)

the answer is b. hope this