What was the importance of the Monroe Doctrine?

Europe would have no intervention within the Western Hemisphere and likewise the United States would not become entangled in European affairs.

The Monroe Doctrine vowed to keep the United States out of European internal affairs and wars.

The political systems of the European powers were alien to the United States and any attempt to export it to the Americas would be considered dangerous to American interests

Presidents throughout history have invoked the doctrine when intervening with foreign affairs.

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where is the diagram

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: