How many americans served in the military during vietnam

economic competition is inefficient and wasteful.good luck

explanation:

where is the picture of the graph or table?

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:

this is a good question! i'll do some research and come back when i have the answer!