LONDON (Reuters) - The United States has entered a recession, according to highly-regarded investor Jim Rogers, who told Britain's Daily Telegraph newspaper on Wednesday he was switching out of the dollar and into yen, the yuan and the Swiss franc. The veteran investor, who predicted the 1999 commodities rally, also said he was still bullish about surging Chinese stock markets despite worries over a bubble. Fears are growing over the health of the U.S. economy after the fallout from the subprime mortgage market crisis and the global credit crunch it triggered. The U.S. Federal Reserve has already slashed borrowing costs...