Why did the railroads initially divide the United States into four standard time
zones?

Originally each locale used its own time: when the sun was directly overhead then it was noon there. ... This setup for telling time began to become impractical as transportation became extensive, reliable, and rapid

Explanation:

the right answer is the end of world war ii

after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.

d! i hope u get it ! xddd