While there is still a significant swath of manufacturing completely done in the United States, that primarily is those companies that are small, unique, or insular in what they are manufacturers of. After all, if what is being manufactured is essentially not readily producible anywhere else except in America, or the quantities so involved, do not provide economies of scale, outside this country, then there isn’t any prevailing reason for that manufacturing to go elsewhere, as there are intrinsic advantages to corporations keeping manufacturing domestic, in regards to training, quality, and control, so of.
However, once a given American company reaches the point in which they are essentially producing a product which can be readily replicated outside America, and of which, the materials needed along with the infrastructure and training are available in foreign lands, of which these countries offer to those corporations labor which is significantly cheaper for those corporations, with environmental laws, along with rules and regulations which are far less restrictive than such are domestically, then it is only a matter of time, before that which was manufactured domestically, becomes during its production and growth phase, manufactured overseas, because in absence of America adding tariffs onto products substantially manufactured outside America, or taxing businesses in a manner in which that which is manufactured overseas necessitates a higher corporate tax, then pretty much nothing will stop the trend of corporations seeking cheaper labor in order to produce goods at a lower price point.
Perhaps all of this foreign labor being contracted for manufacturing work is a net good for America, in whole; but more than likely it is a net good specifically and exclusively for the power brokers of these said corporations, and the stockholders of such, and in absence of robust corporate tax rates or limitations so set for the labor used overseas, a clear net loss for the American public. When American multinational corporations are permitted to manufacture their products utilizing the cheapest foreign labor that serves their purpose, and do not have to answer to anyone outside of the foreign power of those countries, in regards to how that labor is paid or utilized, and further to the point, are not corporately liable for environmental damages, then almost for a certainty, those so contracted by these corporations (who are often without any meaningful economic power) will get no more than the scraps off the table of those who are effectively ruling the roost.
So too, America suffers from an educational system, that performs poorly for those in the lower income socioeconomic bracket, of which, while there used to be plenty of opportunity for the less educated to find a decent job with a decent wage in the manufacturing sector, those positions have been primarily replaced with poor paying and low benefit service type work, with little or no guarantee of continual employment, and little hope of anything other than a bleak future. When the most powerful and richest corporations in this country will not hire domestically because it costs them too much, and the governance of this nation, can’t seem to do a constructive thing about that, then the great chasm of those that have it all, as compared to those that have next to nothing, will get ever worse, and that isn’t right.