Stock futures flat as U.S. and Canada appear headed for trade war

U.S. stock-index futures were little changed on Sunday, as it appeared the U.S. was on the verge of an all-out trade war with Canada, one of its biggest trade partners.

U.S., Canada Spiral Toward Trade War

Canada responded to new U.S. tariffs with levies of its own as the two sides trade blame for collapse of talks.

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