Economic self reliance

A lot of American jobs have been sent over seas where the labor rate is cheaper. As a result almost nothing is actually built in America anymore. This an obvious problem, one that the government doesn't seem to care much about. I find that very odd.

While it is impossible to be a totally self sufficient island in the world economy I am worried about America's absolute reliance on the world economy as a whole. If we become solely dependent on one country or continent for something and that part of the world decides they don't like us anymore what will happen? During World War II the U.S. auto factories made our tanks, bombs, and planes. Will the next war be called off because we can't buy the necessary electronics to run our war military? I would think that the government would force certain manufacturing capabilities to remain within the U.S. control to ensure we can defend ourselves.

Yes, labor is cheaper in other countries, but shouldn't we have tariffs and taxes in place to ensure that we retain certain basic abilities within our own country? Shouldn't we have the ability to rely on ourselves in times of crisis or war?

I know none of this is new or even very exciting, but I have never heard a good answer to these basic questions. I can't believe the government hasn't considered the possibility of another war or some natural or political disaster wiping out one of the suppliers of basic goods. But where are the answers?