North America was a continent on the planet Earth. During the 20th and 21st centuries, it was the continent on which the nation states of Canada, the United States of America and Mexico were located. Several UNIT bases were in North America. (TV: The Stolen Earth)
New York City, the second largest city in North America, was attacked by the Daleks twice, once in 1930 and again in 2009. (TV: Daleks in Manhattan/Evolution of the Daleks, The Stolen Earth)