It's not just Canadians who are holding back on cross-border travel amid a U.S. trade war that has soured bilateral relations.

The number of Americans coming to Canada is also dropping off. New data published by Statistics Canada Thursday shows a 10.4 per cent decline in U.S. resident trips by automobile in June — a steeper drop than what was registered the month before.

According to the federal agency, 1.4 million Americans made the trip north by auto last month, compared to roughly 1.56 million who did the same last year. That decline has political and business leaders on the Canadian side of the 49th parallel concerned given how much these visitors spend when they come.

Last year, American visitors contributed a record $15 billion to the economy.

There is a silver lining, though:

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