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None of the U.S. territories observe DST. This includes [[American Samoa]], [[Guam]], [[Puerto Rico]], [[Northern Mariana Islands]], the US Minor Outlying Islands, Palmyra Atoll, and the US Virgin Islands.

None of the U.S. territories observe DST. This includes [[American Samoa]], [[Guam]], [[Puerto Rico]], [[Northern Mariana Islands]], the US Minor Outlying Islands, Palmyra Atoll, and the US Virgin Islands.

[[Arizona]], with some exceptions such as the [[Navajo]] reservation, does not use DST. The 1967 DST trial in Arizona provoked so many negative reactions that DST was never again used there. People in Arizona, including many businesses, farming communities, and parents, preferred to remain on [[Mountain Standard Time]] throughout the year, claiming that DST produced no benefits for them.

[[Arizona]], with some exceptions such as the [[Navajo]] reservation, does not use DST. The 1967 DST trial in Arizona provoked so many negative reactions that DST was never again used there. People in Arizona, including many businesses, farming communities, and parents, preferred to remain on Mountain Standard Time throughout the year, claiming that DST produced no benefits for them.

All other 48 states that have not [https://www.law.cornell.edu/uscode/text/15/260a exempted themselves] currently use DST as allowed in [https://uscode.house.gov/view.xhtml?req=granuleid%3AUSC-2012-title15-chapter6-subchapter9&edition=2012 |15 USC Chapter 6, Subchapter Ix: Standard Time]. Any state may exempt itself from DST at any time:

All other 48 states that have not [https://www.law.cornell.edu/uscode/text/15/260a exempted themselves] currently use DST as allowed in [https://uscode.house.gov/view.xhtml?req=granuleid%3AUSC-2012-title15-chapter6-subchapter9&edition=2012 |15 USC Chapter 6, Subchapter Ix: Standard Time]. Any state may exempt itself from DST at any time: