Sources

Time zones and their history

• Chicago Public Library, Standard Time, 1883: the General Time Convention in Chicago and the Day of Two Noons.
• National Geographic, The history of daylight saving time in America: the 1918 Standard Time Act, war time, the 1966 Uniform Time Act and the 1974 experiment, including the poll numbers.
• Wikipedia, Time in Indiana: Indiana's zone history and today's county split.
• Wikipedia, Uniform Time Act: state exemptions and the 2007 extension.
• US Department of Transportation, Daylight Saving Time: which states and territories don't observe it.
• timeanddate.com, Energy Policy Act of 2005: the current start and end dates.

Health and safety

• American Academy of Sleep Medicine, Permanent standard time is the optimal choice for health and safety, Journal of Clinical Sleep Medicine, 2024.
• American Academy of Sleep Medicine, Fall back should be the last clock change, sleep experts tell lawmakers, October 2026: the Coalition for Permanent Standard Time.
• Fritz and others, University of Colorado Boulder, Spring forward to daylight saving time brings surge in fatal car crashes, Current Biology, 2020.
• Manfredini and others, Daylight Saving Time and Acute Myocardial Infarction: A Meta-Analysis, Journal of Clinical Medicine, 2019.
• Giuntella and Mazzonna, Sunset time and the economic effects of social jetlag, Journal of Health Economics, 2019.
• Niu and others, Longitudinal Position and Cancer Risk in the United States Revisited, 2023: the follow-up that didn't find the cancer link.

Polls and legislation

• Gallup poll on daylight saving time, January 2025, as reported in Most Americans say they're ready to end daylight saving time.
• Sleep Foundation, Latest updates on daylight saving time in 2026: the July 2026 House vote.
• House Energy and Commerce Committee, House passes legislation to make daylight saving time permanent, July 14, 2026.
• Spectrum News 13, Clocks fall back an hour after Senate stalls proposed permanent time bill, November 1, 2026.

Names

• Wikipedia, List of US state name etymologies: 24 of 50 current names from Native languages.
• Government of Canada, Statement on the restoration of the name Haida Gwaii, June 2010.
• Minnesota Supreme Court, Save Lake Calhoun v. Strommen, 2020.
• National Park Service, Naming a Mountain: the history of the name Denali.
• Wikipedia, Secretarial Order 3404: the 2022 federal renaming.
• For individual state names: Etymology of Manhattan, Shawnee, Catawba people, Tuscarora people, Puget Sound, Illinois Confederation, Kaw people, Alabama people, Ho-Chunk, Connecticut, Nipmuc Indian Association on Quinnehtukqut, Yanaguana, Atakapa.

Map data

• US Census Bureau cartographic boundary files, via us-atlas.
• US Census Bureau county population estimates, 2024.
• Office of Management and Budget metropolitan statistical area delineations.
• GeoNames for city locations.