1. the battle of antietam severely weakened the union army. shifted control of the civil war from the south to the north. was the last battle that took place in the eastern united states. convinced europe to support the confederacy.

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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: