The mongol conquests of much of eurasia in the thirteenth century tended to encourage trade along the silk roads primarily by:

cuban communists pressured the soviet union to place missiles in cuba.

question is unclear.

i can't sorry.

post the full question so i can .

whats the question? im not quite understanding your question.

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: