One
By reling on offshore producers of provide us with goods we have weakened our ability to be self substaining in a sense. If China and Japan stopped selling us goods we could be in a real big hurt as we have partially lost the ability to make things ourselves.
Another good example is that for many years it was totally illegal to sell or give our computer technology to foreign countries, but now almost all computers, ie. PC's are made elsewhere and like China they have been incorporated into their long range missle systems of which some are pointed at us.
Another interesting fact is this: did you know that the largest amount of 'hackers' attacking the US are all from China. I think the Chinese government pays these people to disrupt any and all US installations and most of the ones belonged to the Feds.
Bill