“What is the world’s largest tax haven? If you guessed any country in the Caribbean, South Pacific, Asia, the Middle East, Africa, Central or South America or Europe, then you would be wrong. Only the United States can lay claim to that title. Ever since the French loaned money to the struggling revolutionaries who defeated the British to create the United States, to today where the Chinese are buying U.S. Treasury debt, the United States would not be able to maintain its economy without large inflows of foreign capital. Foreign investors can invest in the United States virtually tax free — in structures that are legally protected from risks and, currently, with secrecy.”
http://www.moneynews.com/Kleinfeld/tax-haven-US-investor/2013/07/08/id/513734