DST was implemented in the United States nationally on Mar. 31, 1918 as a wartime effort to save an hour’s worth of fuel (gas or oil) each day to light lamps and coal to heat homes. It was repealed nationwide in 1919, and then maintained by some individual localities (such as New York City) in what Time Magazine called “a chaos of clocks” until 1966 when the Uniform Time Act made DST consistent nationwide. [8]
Approximately 1.5 billion people in 70 countries observe DST worldwide. [26][29] In the United States, 48 states participate in Daylight Saving Time. Arizona, Hawaii, some Amish communities, and the American territories (American Samoa, Guam, Puerto Rico, the Virgin Islands, and the Northern Mariana Islands) do not observe DST. [8] As of Mar. 4, at least 44 bills to change daylight saving were being actively considered in 24 states in 2019. [33] 55% of Americans said they are not disrupted by the time change, 28% report a minor disruption, and 13% said the change is a major disruption. [20]
(via Top 3 Pros and Cons of Daylight Saving Time - ProCon.org)
Source: procon.org





