Twenty-one years ago this week Harold S. Vanderbilt's yacht Rainbow defeated Thomas Octave Murdoch Sopwith's Endeavour to retain the America's Cup for the U.S. It was one of 16 British attempts to recapture the Cup since they had lost it in 1851. Sopwith skippered his blue sloop to a quick brace of victories in the four-out-of-seven-race match, and although Endeavour was the favorite, Vanderbilt's superior sailing won the next four events. In 1937 England again failed to regain the Cup. It has not been challenged since.