Actually, the U.S. Dollar is made stronger when we create more items we can successfully sell on the world market. Such items create demand for our dollars and cause more of our dollars to be spent here.
Oil coming from unexpected places in the US is just that sort of paradigm shifter.
Our production of ANYTHING marketable more than could have been anticipated does this. The same thing would be true if our food production magically doubled or our electricity prices shot downward.
I'm not sure this would apply to "items" across the board. The U.S. dollar was very strong back in the late 1990s when everyone and anyone was moving manufacturing to Asia. This was also right after NAFTA was pretty much fully implemented, too.
Most of the foreign money coming into this country isn't buying "items" at all. Instead, it's flowing into our capital markets in the form of stock, bond and real estate purchases.