An effect of the land ordinance of 1785 and the northwest ordinance of 1787 was that
the united states nearly doubled in size.
the practice of slavery spread to the north.
explorers searched for a water route across the continent.
conflict increased between settlers and american indians.

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:

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it would weaken the prestige of japan’s military.