Major tariff wars and consequences in history:

18th Century Sino-British-French Tariff War: Seven Years' War

1879 British-German Economic Conflict: Outbreak of World War I

1930 U.S. Tariff Act: Global Economic Depression => Outbreak of World War II

1980 U.S.-Japan Trade Friction: Plaza Accord

Why didn't the U.S.-Japan trade friction lead to war? Because Japan did not have independent national defense.

Therefore... so...