What is the balance of power between the state and federal governments?

The U.S. Constitution uses federalism to divide governmental powers between the federal government and the individual state governments. The Tenth Amendment tells us that all powers not granted to the federal government are reserved to the states. Anwser is Federalism

answer; i believe its (cpr);

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: