American support for annexing the British-controlled colonies to the north peaked in the 1860s and persisted into the 1900s.

U.S. place names are rooted in Indigenous languages, physical characteristics and honorifics for politicians and pioneers—and they can be controversial.

The monument's colorful history includes a fraudulent bond election, a mistaken design competition winner—and a civil rights protest in the sky.

The completion of the transcontinental railroad drove synchronization of public clocks—and the start of celebrating at the stroke of midnight.

The 1965 U.S. law requiring health warnings on cigarette packs played a key role in bringing about a new era of tobacco regulation.

In 1952, news stations combined two new technologies—the TV and the computer—to forever transform how voters experience election night.

The department, established in 1867, faced opposition from Southern congressmen, who associated it with education for the formerly enslaved.

A gold prospector dubbed the peak Mount McKinley in 1896, but Alaskans have historically championed Denali, a name rooted in its Native American history.

A 1929 prepaid hospital plan created in Dallas gave rise to early health insurance companies—and helped spur the growth of a major industry.