Here's how America got itself into this: as the US imports far more in goods and services than it exports,it needs someone to step in a lend it the money to keep spending on imported cars, Italian marble for monsterhouses, and lots of the stuff you see on the shelves at SEARS or Wal-Mart. As it turns out, two of the biggestbankers for the world's uni-polar superpower are a couple of middle military powers, Japan and China. Giventheir huge trade and payment surpluses with the US, their currencies should have risen sharply against thedollar this year. Instead, Japan's yen has appreciated only slightly, and the Chinese yuan has remained rocksteady, given its formal fixing to the dollar. With all the dollars they earn, China and Japan have bought USTreasury debt in huge amounts, becoming bankers to the world's biggest military power. By this summer,holdings by the Federal Reserve of paper on behalf of foreign governments have soared from some $600 billionin July of last year to $750 billion. Asia is mostly responsible for that increase.