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>2. It discourages US workers from spending some of their careers overseas, thus reinforcing US cultural insularity and giving competitive disadvantages. Go to any interntional company's office in Singapore, Shanghai, Kuala Lumpur and note that it's filled with Brits, Australians, New Zealanders with very few Americans; this is why.

It's worth pointing out that Singapore and Malaysia are both British Commonwealth countries, which does make it much easier for the Brits, Aussies, and New Zealanders to move to and work at those locations. Shanghai was also one of the major trading ports(along with Hong Kong) for the British with China, so they also have a very long history with the British Empire.