What is one purpose of the supremacy clause of the constitution? a. it ensures that citizenship rights are retained only by certain people. b. it prevents the federal government from gaining too much power over the states. c. it ensures that the relationship between state and federal laws remains clear. d. it enables checks on the power of each branch of government.

that answer is wrong. It’s B. It ensures that the relationship between state and federal laws remains clear.

Explanation:

answer; i believe the answer is (mesopotamia); modern day

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: