Why are there time zones in the US?

Related questions

1. Do Clocks go forward or back?
2. What states are CST timezone?
3. Do Clocks go forward or back in April?
4. Which country is 12 hours ahead of India?
5. Why is Brisbane time behind Sydney?
6. Which country celebrates New Year's Day all year round?
7. How far is CST behind GMT?
8. What time zone is 2 hours ahead of Central?
9. Do Clocks go forward in Europe?
10. What is considered Pacific time?

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23. #arrivals
24. #states