North America
From Tardis Wiki, the free Doctor Who reference
North America was a continent on the planet Earth. Several UNIT bases were in North America. (TV: The Stolen Earth)
In Roma I, Marcus Americanus 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)