Welcome to our guide to the energy and commodities powering the global economy. Today, reporter Robert Tuttle looks at the close integration of US-Canadian oil markets and what that means for Donald Trump’s tariff plans.

Canadian officials are preparing retaliatory measures if the new U.S. administration imposes tariffs on Canadian imports.

The cheap Canadian oil America craves is becoming a key bargaining chip in President Trump’s threatened trade war.

Restricting the flow of energy to the U.S. is one measure being discussed in Canada in the event of a trade war, but it’s controversial. The premiers of Alberta and Saskatchewan have said they’re against moves to curb energy sales to the U.S., which are the primary source of the U.S.’s trade deficit with Canada.

Chrystia Freeland, the former finance minister who is running to replace Justin Trudeau as Canada's prime minister, says her country needs to release a “retaliation list” of goods the country would ta