Verified answer

His name was Robert Dickson. You'll find that he was held responsible for preventing US annexation of Canada after the British lost the War of 1812.

Here's a bit more on him:

http://www.galafilm.com/1812/e/people/dickson.html

http://clarke.cmich.edu/nativeamericans/mphc/warof...

http://www.adrax.com/watsons/doc2.htm

Either John McGregor, Louis Riel or Alexander Mackenzie ... all of them were frontiersmen and helped settle the western part of Canada. I'd go with the first or the last names, however.

Louis Riel

Pierre Radisson, possibly.