I'd concur with that; but in imports also impact upon the US economy in at least two very important ways that are hard to measure.
One is the improvement in the quality of life of the American consumer to have access to imported goods. For example, since the days of the founding fathers we've considered imported coffee to be as American as well, apple pie.
The other is that when the American consumer has the freedom to choose his market, he can be free from the tyranny of a Buchanan union stooge and can buy what suits him. This freedom of the masses can then keep the the Patsy vendor from fleecing the public.
Protectionism is welfare under a different name. Americans forced to pay extra for domestically-produced goods are basically having their income redistributed to a certain segment of American society.