"There will come a day when free traitors are utterly repudiated. I await that day."
America has been a big trading nation for a very long time. We've traded with poor areas, rich areas, depressed areas, booming areas etc.. And it hasn't hurt us in the past. I wouldn't hold your breath waiting for a future day when trade will hurt us a nation.
And if one were to leap off a twenty story building, one would not be hurt...until the last instant.