Nixon's biggest foreign policy blunder was the diplomatic warming toward China. An even more major blunder under the Bush family terms. We should have never moved the first factory there. With factories come obtaining technology which China will eventually use against us military wise and economically.
Ironically Japan's investing their factories here somewhat helped keep the failed Obama economic policies and economy downturn from hurting areas where Japan's based USA manufacturing has factories. As Reagan said "Trade partners not trade patsies."