That sounds plausible until you actually start digging.
Economic growth in the US was NOT linked to exports. In fact, US exported hardly anything during the first post-war years (hardly anybody in Europe could buy imported stuff).
Ultimately, economic growth is not linked to external expansion - it is also linked to internal expansion. Slashing the cost of a $500 widget to $50 immediately opens up a lot of internal market - and that has been the main engine of US and European economic growth for quite a bit of time.