Time zones were created due to the chaos of local solar time caused by expanding railroads and telegraph networks. Before standardization, over 300 local times existed in the U.S., making it challenging for trains to run on schedule and heightening the risk of accidents[3][5]. On November 18, 1883, the U.S. and Canadian railroads adopted four main time zones, inspired by Sir Sandford Fleming's proposal for standardization, which also led to the International Meridian Conference that established Greenwich Mean Time as the world standard[4][6].
Today, time zone borders still reflect human decisions rather than strict geographical lines, adapting to political boundaries and local needs, which can sometimes create discrepancies in solar time[6].
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