What held European society together after the fall of the Carolingian Empire?

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:

equal area projections

equal-area projection. a projection in which regions on the earth's surface that are of equal area are represented as equal.

the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.

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