North America

North America was a continent on the planet Earth, located above Central and South America. It was originally inhabited by the Native Americans. (TV: "The Sea of Death") The Americas were separated from Europe and Africa to the east by the Atlantic Ocean. (TV: War of the Sontarans) Several UNIT bases were established in North America by the 21st century. (TV: The Stolen Earth)

Geography
North America included the bordering nations of America (TV: Dalek, Revenge of the Slitheen) and Mexico. (TV: The Zygon Invasion) The Bering Strait ran between East Russia and Alaska, (PROSE: Doctor Who: The Encyclopedia) the latter of which was called the "stepping stone between America and Asia" by the Fifth Doctor. (AUDIO: The Land of the Dead)

The Mississippi was the longest river in North America, and, in the time of the Old West, people used to romance, talk, fish, and gamble to occupy their time. (COMIC: )

21st century
In the 2000s, transducers used by the Slitheen briefly caused a massive power loss stretching westwards from the West Coast of North America, including Los Angeles. (TV: Revenge of the Slitheen)

By the 2000s, North America was part of the worldwide nuclear grid overseen by UNIT. (TV: The Poison Sky)

In the 2010s, the Mexico border was among the places where newly-hatched Zygons were settled across Earth as part of Operation Double, resulting in a minority of Zygons residing in New Mexico, USA under the pretence of being British migrants. (TV: The Zygon Invasion)

The North American blizzard occurred in March 2017. (PROSE: Time Lapse)

22nd century
In the 2190s, the Daleks dug up most of North America to build a mineshaft through which they could place a propulsion unit at the planet's core. (AUDIO: Lucie Miller, To the Death)

Parallel universe
In Roma I, Marcus Americanius Scriptor's family ruled Northern America from their family home since Marcus' great-great-grandfather Americanus was sent to quell a republican revolution 140 years before Marcus' birth. When Marcus was ten years old, he wrote a three-volume history of America and its people. 100 million people lived in America at this time. (PROSE: Warlords of Utopia)

Other references
While undercover at the Pharm, "Samantha Jones" claimed North America among the places she had visited. (TV: Reset)