Contrary to what you might think, the Fannie-Freddie fallout has far-reaching ramifications not just for the U.S. housing market, but key financial centers across the planet (China, Luxembourg and Britain, just to name a few). So, just how much does each country hold – and what, exactly, is everyone going to do about it?

For more than a decade, Fannie Mae and Freddie Mac, the housing giants that make the American mortgage market run, have attracted overseas investors with a simple pitch: the securities they issue are just as good as the United States government’s, and they usually pay better.

The marketing plan worked. About one-fifth of securities issued by Fannie, Freddie and a handful of much smaller quasi-governmental agencies, some $1.5 trillion worth, were held by foreign investors at the end of March. One out of 10 American mortgages is, in effect, in the hands of institutions and governments outside the United States.

Now that the two companies are at risk, how their rescue is handled will ultimately test the world’s faith in American markets. It could also influence the level of interest rates and weigh on the strength of the dollar for years to come, analysts say.

“No less than the international perception of the credit quality of the U.S. government is at stake,” said Richard Hofmann, an analyst with CreditSights, an independent research house with offices in London and New York.

Also at stake is Americans’ future ability to gain access to credit. If foreign companies and governments abandon United States investments, home, auto and credit card loans will be much more difficult to come by.

That helps explain why Treasury Secretary Henry M. Paulson Jr. is pressing American lawmakers for the authority to inject unspecified billions in cash into either company or both. The “blank check” nature of his request has raised concerns on Capitol Hill, but Mr. Paulson is betting that Congress is even more fearful of the consequences of doing nothing to rescue Fannie and Freddie.

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