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By Caroline Valetkevitch NEW YORK (Reuters) - Five years ago, the United States was in the midst of its worst recession in seven decades, and stocks were feeling it. On this day in 2009, the S&P 500 hit its nadir, closing at 676.53. That low marked a climax of a 16-month selloff that took more than half the S&P 500's value. Naturally, some investors are questioning whether the bull run is nearing an end.