Like I said before, you can't effectively maintain a manufacturing-based economy with an over valued currency because mature manufacturing is fundamentally a race to the bottom. Profit margins are razor thin, and operating with an over valued currency in this space is like fighting with both hands tied behind your back. That's why the US chose to focus on profit-rich industries like software where it could dominate its rivals through first move advantage, and out sourced profit-poor manufacturing to its vassals.
I wouldn't necessarily make a statement like this. Especially when we are in the midst of significant technological change. Cost advantages may accumulate to a point of where it is not efficient to outsource.
Furthermore, we are returning to an age or mercantalism, while capital flows are significantly different from the 18th century, I would argue we are once again at a point of where industry will largely stay in one place.