Question

Which project led to the creation of a system of time zones across America?

Answer 1

America's railroads began using a standard time system involving four time zones, Eastern, Central, Mountain and Pacific

Step-by-step explanation:

I used the the History Channel website and I got the question right on a test

Answer 2

On November 18, 1883, America's railroads began using a standard time system involving four time zones, Eastern, Central, Mountain and Pacific.