And believe it or not (I'm sure you don't) but the levels people doing well do not rise and fall with how profitable corporations are, or with imports.
Boy are you wrong. They very much do. Some 60% of the workforce works for corporations, most of them large. What do you think happens to their job if that corporation isn't profitable?
Furthermore, domestic jobs profit immensely from imports. Tell me, how many countries have companies as big as Microsoft, Intel, Google, Apple, AMD, nVidia, and Facebook? Oh, that's right, not many. Guess what else? These companies would never make it without being able to import goods. In fact one of the reasons they reside in the US and nowhere else is precisely because we have so many trade agreements that have removed exactly the kind of barriers that you advocate.
But they do with tariffs.
They fall with tariffs, if that's what you mean. Again, look at what happened as a result of Smoot-Hawley, which ironically was a republican move, and the likes which of Al Gore was pointing at when republicans opposed NAFTA.
The first treasurer of the US, Alexander Hamilton knew it. Abraham Lincoln new it. So did Roosevelt, Truman, Eisenhower, Kennedy LBJ and Nixon.
Which Roosevelt would that be? Because FDR AND Truman both instituted policies to counteract Smoot-Hawley; that is, they gradually repealed all of those tariffs. Shockingly enough, only very very recent democrats are in favor of high tariffs, and their reasons for doing so are very poorly thought out.