Who successfully delivered to Concord the colonial message that British troops were on their way on April 18, 1775? Patrick Henry Samuel Prescott Mercy Otis Warren Samuel Adams

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:

john maynrd keynes developed new economic respose to the                           ( b. great depression if the 1930's)