The year is 1868. you are us senator from the great state of pennsylvania and you have just heard all of the evidence in the impeachment trial of president andrew johnson. how do you vote - for removal from office or against removal from office? why?

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: