WI USA Remained Protectionist After WW2?

What if, rather than as in OTL, the USA moving to a free trade stance (at least on non-agricultural products) the USA had remained protectionist?

How exactly would it have affected the American and world economies?

How would it affect the US's foreign policy and relations to other nations?

Also how would it affect US domestic politics (considering that any changes in the makeup of the economy would probably also effect America's political landscape too)?
 
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