But we used slave labor and the FedGov provided massive subsidies to corporations such as the railroads. Abe Lincoln was a big proponent of using government largesse to try to jump start industry. He really pushed for it in Illinois, but the result was massive fraud and waste. Illinois ended up passing a law forbidding the granting of state monies to private firms in the name of internal improvements, etc.
If tariffs are such a sweet deal, then states should be able to levy them against each other. Think of all the jobs that could be created if the citizens of each state have to build their own cars, program their own computer software, and grow their own potatoes! The Constitution forbids states from levying tariffs against each other, which created a giant free trade zone that encompassed different regions and climates; that contributed more to American industrial development more than protective tariffs against foreign firms.
Total free trade would not lead to national ruin; on the contrary, it would lead to increased economic growth, as trade always does.
Manufacturing is an activity that does not, in itself, create wealth. I could start a factory that made the highest quality skunk flavored soda pop in the world, but if nobody liked it, I am destroying wealth with each new bottle that comes down the line; the resources I am using to make skunk soda could be better used making berry flavored soda, or whatever people liked. I could, on the other hand, create a product that is highly useful and seemingly desireable. If people decide that my new product is not preferred to the other goods they could obtain, then I am wasting resources if I continue to build it. Trade, however, always creates wealth. Imagine two guys are walking through an orchard, and an apple just happens to fall into the hands of one of them, while a peach fell into the other guy's hands. They trade the peach for the apple; wealth is created, even though neither man manufactured anything, or even did any work at all. This is because each gave up something he valued less for something he valued more. If a third party, which we'll refer to as "the government", interferes in the transaction, and mandates that each peach is really worth two apples, but the guy with the apple (who wants the peach) would rather not climb one of the trees to get a second apple, then the two do not trade, and each is worse off than he otherwise would be.
Yes trade does always create wealth. However it creates wealth for those that can bring a product to market with the lowest over head. If a foreign entity brings a product to market using very low paid employees as well as government subsidies they will "win" the trade war every time. When they win our industry suffers. Of course if we are willing to move our industry to foreign shores and hire those same low paid workers then what was our industry can compete. Those that advocate totally free trade are also advocating the movement of our industry and the lowering of our wages. These result in the backwards movement of our economy to third world status. This is the primary goal of the one world, one people, one economy movement.