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Arizona (with the exception of the Navajo Nation) and Hawaii do not observe Daylight Saving Time.
Indiana adopted its use beginning in 2006. American Samoa, Guam, Puerto Rico, and the Virgin Islands still do not observe DST.

en.wikipedia.org/wiki/Daylight_saving_time_in_the_United_States

During World War I, in an effort to conserve fuel, Germany began observing DST on May 1, 1916. The rest of ...

www.timeanddate.com/time/us/arizona-no-dst.html

Almost all of the US state of Arizona does not use Daylight Saving Time (DST), ... set the clocks forward 1 hour in spring for DST with the rest of the United States.

www.tulsalibrary.org/faq/which-states-do-not-observe-daylight-saving-time

Currently, Arizona, Hawaii, the eastern time zone portion of Indiana, Puerto Rico, the U.S. Virgin Islands and American Samoa do not observe Daylight Saving ...

www.aol.com/article/lifestyle/2017/03/10/states-opt-out-daylight-saving-time/21879629

Mar 10, 2017 ... Well, not everyone's. Arizona and Hawaii don't follow daylight saving time like the rest of the U.S. — but they used to. Fiddling with the clocks ...

www.usatoday.com/story/news/nation-now/2017/03/09/arizona-no-daylight-saving-time/98964644

Mar 9, 2017 ... Clocks will remain untouched as daylight-saving time officially starts. ... While other states are lumped into time zones, the Grand Canyon State stands alone. ... Before World War I. The first use of daylight saving dates to July ... But don't most New Yorkers think everybody else is at least four hours behind?

thefw.com/2-states-dont-observe-daylight-saving-time

Mar 10, 2017 ... Daylight Saving Time is upon us. Well, most of us. Yes, this Sunday, March 12 at 2 a.m., we spring forward by moving our clocks ahead one ...

www.csmonitor.com/USA/USA-Update/2016/1105/Which-states-want-to-drop-daylight-saving-time

Nov 5, 2016 ... ... along with three US territories, already don't observe daylight saving time. ... it wasn't adopted in the United States for well over another century. ... found annual energy usage declined about 0.03 percent because of the ...

www.12news.com/news/local/arizona/heres-why-arizona-doesnt-observe-daylight-saving-time/344384243

Mar 10, 2017 ... DST started when "war time" was established in the U.S. in 1918 to ... For most Arizonans, it means we'll be on the same time as the states west of ... Longer sunlight means more air conditioning and more energy used. .... I am, however glad that I don't have to worry about resetting my clocks twice a year.

news.nationalgeographic.com/news/2015/03/150306-daylight-savings-time-spring-forward-united-states-science-nation

Mar 6, 2015 ... For most of the United States, this weekend sees the return of clock ... Each U.S. state and territory is free to ignore daylight savings time, ... "Many people don't want to move their clocks, whether it's ... Research shows that given an extra hour of evening daylight, many Americans use the time to go out and ...