The ban also covers dairy and motorcycles, escalating a trade fight that experts expect could drag on for months. U.S.-Canada relations, already tense, are likely to deteriorate further after the United States went ahead early Tuesday with a decision to ban nearly $1 billion worth of Canadian imports, including alcoholic beverages, dairy products and motorcycles Key points and original sources are listed below.

• The ban also covers dairy and motorcycles, escalating a trade fight that experts expect could drag on for months.S1

• U.S.-Canada relations, already tense, are likely to deteriorate further after the United States went ahead early Tuesday with a decision to ban nearly $1 billion worth of Canadian imports, including alcoholic beverages, dairy products and motorcyclesS2