This has been a historic month for Wall Street in more ways than one. In addition to the Dow Jones Industrial Average (^DJI +0.72%), S&P 500 (^GSPC +0.22%), and Nasdaq Composite (^IXIC +0.20%) closing at record highs on May 28, we've witnessed a rare changing of the guard at America's foremost financial institution, the Federal Reserve. May 15 marked the final day of Jerome Powell's second term as Fed chair, paving the way for President Donald Trump's handpicked nominee, Kevin Warsh, to grab the reins. On M ...