Why does the US have daylight saving time?

Only Arizona and Hawaii are exempt from changing the time twice a year to account for daylight saving time.

Daylight Saving Time 2024: When Does the Time Change?

U.S. Senate approves bill to make daylight saving time permanent

What you need to know about the history of daylight saving time : NPR

Visualizing the Impact of Permanent Daylight Savings Time on Winter Sunrise and Sunset Times // Conor McLaughlin

One problem with permanent Daylight Saving Time: Geography

What would permanent daylight saving time look like for Florida?

When Is Daylight Saving Time? - The New York Times

Daylight savings time 2021: When do we change our clocks?

Making daylight saving time permanent: Where all 50 states stand

Here's How Daylight Saving Time Affects Your Part of the Country

Daylight savings time: When did it start? Why do we turn clocks back?