Canada

Canada is a nation in North America.

In 2009, "The Provinces and Territories of Canada" were among the nations which agreed to let John Frobisher speak on their behalf to the 456. (TW: Children of Earth: Day Three)

In 2040, Canada held a national referendum on whether to merge their military with that of the United States. (ST: The Nuclear Option)

Sometime before 2050 a Korven spacecraft carrying a Space-Time Manipulator crashed in the frozen wastelands of Canada. The Manipulator was later salvaged by The Department. (K9TV: Angel of the North)

In 2054, the Montana Republican Militia used thermosystron bombs in an attempt to take over Canada. (EDA: Alien Bodies)

During the 22nd century Dalek invasion, some American citizens were evacuated to Canada. (PDA: The Final Sanction)

In an alternate timeline in which Germany won World War II, the British government went into exile in Canada. (NA: Timewyrm: Exodus)

At some point in the future, parts of Canada become wasteland, with giant residential towers, including Toronto Tower being erected in centres such as Toronto, Ontario. (BBCR: The Last Voyage)

Behind the scenes

 * Doctor Who was filmed in Vancouver, B.C. in 1995-96, the first time a Doctor Who production had been mounted in North America. Discounting some second-unit footage shot in New York City for DW: Daleks in Manhattan, Canada remains the only North American country to host a complete production.
 * Canada was the first country in North America (and one of the first outside the UK) to see broadcasts of Doctor Who when the Canadian Broadcasting Corporation debuted the first season in 1964 (it was cancelled a year later, however). Viewers in Edmonton, Alberta were also the first to see the 1996 TV movie, which aired there a few days before it was shown in the US. In 2005 Canada repeated history by once again becoming the first North American country (and one of if not the first non-UK countries) to see the revival series, again on the CBC.
 * The origins of Doctor Who also owe a debt to Canada, as Sydney Newman, considered one of the creators of Doctor Who, was a Canadian working for the BBC.