The caste system in india was used for what purpose
a) to ensure that all people had an adequate income

b)to prevent the rich from taking to much power

c) to provide social control and conformity acording to ones birth

d) to draft a military capable of defending india from mongol invasion

mexico south america

explanation:

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: