I would argue that 10% of anything cannot have a huge affect. It is like the Smoot Hawley lie. Smoot Hawley is the poster child of Free Trade. Well it didn't have much of an impact at all Why? because trade was only 5% of GDP, so it mathematically could not have a huge impact. We made our own stuff back in the 1930's the country hadn't bought into the gloBULLism that today's America has fallen for.
you would argue that but then when you consider the multi-billion dollar taxpayer funded bailout of the auto industry to and I quote "save union jobs" you would look silly doing so.
If 'free trade' existed then our factories and know-how would have been exported to Germany, Japan and China and we would have lost WW II. Thanks to protectionism we won WW II.