As a tribute to the victims of the Ottawa shootings, the national anthem of Canada is sung before an NHL hockey game between the Pittsburgh Penguins and the Philadelphia Flyers in Pittsburgh, Wednesday, Oct. 22, 2014. (AP Photo/Gene J. Puskar)
In this frame grab taken from video, Canada Prime Minister Stephen Harper speaks during a televised address to the nation in Ottawa, Ontario, Wednesday, Oct. 22, 2014. (AP Photo/APTN, Pool)
Crude prices have plunged by 25 percent since June, making it painful or uneconomic for producers in Russia, Venezuela and Iran, for the pioneering shale oil drillers in America's heartland and for Canada's oil sands extractors. (Andrew Harnik/The Washington Times)
Eugenie Bouchard, of Canada, returns a shot against Olga Govortsova, of Belarus, during the first round of the 2014 U.S. Open tennis tournament, Tuesday, Aug. 26, 2014, in New York. (AP Photo/Elise Amendola)
Canada's iconic coffee chain, Tim Hortons, and Miami-based Burger King say they will join forces but will operate as independent brands to form the world's third-largest quick-service restaurant company. (AP Photo/The Canadian Press, Sean Kilpatrick)
Burger King is in talks to buy Tim Hortons in hopes of creating a new, publicly traded company with its headquarters in Canada. The move would help the company avoid America's 40 percent corporate tax rate. (Associated Press)
HitchBOT hitchhikes with strangers to travel from Canada's east to west coast. This Aug. 14, 2014 photo shows the robot nearing the end of its journey. Its final destination is Victoria, British Columbia, Canada which its creators expect it to reach by Aug. 17, 2014. (Associated Press/Ryerson University)
Jim Fox, the leader of the Mid-Iowa Boy Scout Troop 111, says U.S. Customs and Border Protection agents along the Alaska–Canada border detained his troop and pulled a firearm on a child after he snapped a photo of one of the agents. (KCCI)
Jim Fox, the leader of the Mid-Iowa Boy Scout Troop 111, says U.S. Customs and Border Protection agents along the Alaska – Canada border detained his troop and pulled a firearm on a child after he snapped a photo of one of the agents. (KCCI)
Signs like this one in Bradshaw, Nebraska, express local resistance to the Keystone XL pipeline from Canada to the U.S. Gulf Coast, which would run through Bradshaw. (associated press)