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What first divided the US into four time zones?

In: North America, International Date Line [Edit categories]

Relevant answers:

What are the four time zones in the US?
Eastern Standard Time Central Time Rocky Mountain Standard Time, or Mountain Time Pacific Time Alaskan Time Hawaiian Time Eastern Standard Time Central Time Rocky Mountain Standard Time Pacific Time
What are four time zones of the US?
pacific, eastern, central, mountain
Why was the US divided into four time zones in the 19th century?
Because before that everyone used some local means of time measurement and it was not uniform. Local solar time.The Railroads needed a more regular system for scheduling trains.
Who derived the four time zones in the US?
Originally Railroads.
When did time zones first start in the US?
November 18, 1883