The trade case could exacerbate tensions between the two nations as they wrestle with trade disputes and attempts to renegotiate NAFTA. Canada's case challenges the United States' use of tariffs to punish unfair trade practices and protect its markets, saying those actions violate World Trade Organization rules. The case could expand into a multinational trade dispute given that Canada filed it in a way that allows other countries to join. Toyota and Mazda to Build $1.6 Billion Alabama Plant Five months after announcing that they would reward some U.S. city with a $1.6 billion car plant and 4,000 jobs, Toyota Motor and Mazda Motor said Wednesday that they had a winner: Huntsville, Alabama. Huntsville, home to a number of aerospace manufacturers, is the latest location in the Deep South to emerge as an auto-manufacturing hub. "This is indeed a great day in Alabama," Gov. Kay Ivey said. The two Japanese companies said the plant would open in 2021 and be capable of making 300,000 cars a year.