The USA exports and imports the same goods - cars, trucks, even computers. So Americans may buy Intel or AMD CPUs, but then so do Japanese, from either domestic or foreign locations. Refer to intraindustry trade for more info. The example posits a world without change. Finally, some notes on the basic absurdities which are ignored by free traders.
Gainers compensate the losers from trade.
Wages at home are equal in all industries. The country has no trade deficit. The assumption that gainers compensate losers from trade was replaced by the assumption that if you replaced tariffs with income taxes on the gainers from trade, and subsidized the losers, everything would balance out in the end. Add up all the dollar gains from trade exporters get, tax them exactly, and then add up who lost, and give the exact amounts to whoever lost. What an unholy mess this would create, not to mention more golden opportunities to manipulate the tax system for the benefit of a few.