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How the U.S. has used tariffs through history — and why Trump is different, economists say

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The U.S. has used tariffs since its founding in the 18th century .

They were primarily a way to raise revenue in the nation's early days .

Later, tariffs were largely used to restrict imports or as a bargaining chip to reduce trade barriers.

Today , "tariffs simply cannot raise enough revenue to fund government expenditure," expert says.

No previous president has tried to link a U.S. drug crisis to trade policy, as Trump did with fentanyl.

Trump imposed a 10% additional tariff on all Chinese goods, for example, and threatened a 25% tariff on imports from Canada and Mexico .

Global trade treaties establish a mechanism for nations to file grievances for alleged unfair trade practices.