Foreign Investors Planning on Investing in the US

Because nations are not required to accept the laws of a foreign government, offshore jurisdictions are, in most cases, immune to the laws that may apply where the investor resides. U.S. courts can assert jurisdiction over any assets that are located within U.S. borders. Therefore, it is prudent to be sure that the assets an investor is attempting to protect not be held physically in the United States.
Source: http://www.investopedia.com/articles/basics/03/050803.asp
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