CBC News reports on the "full-scale trade war between Canada and the U.S." as Prime Minister Justin Trudeau announced Canada will launch retaliatory tariffs on $155 billion worth of American goods in the coming days.

President Trump agreed to delay tariffs on Mexico and Canada for a month after both countries pledged to do more to block drugs and migrants.

Trump knows the United States has more leverage over its neighbors than they do over his country. But exploiting that position of strength could cause a historic rupture.