"Once more after an Interruption of ten Years, I pronounce myself a happy Man, and pray Heaven to continue me so." Thus wrote John Adams in late August 1784 after the arrival in Europe of his wife Abigail and daughter Nabby. Adams and his family were living together in the pleasant Paris suburb of Auteuil. There Adams, with Benjamin Franklin and Thomas Jefferson, formed a joint commission to conclude commercial treaties with the nations of Europe and North Africa. For the first time since he had left America in 1778 on his first diplomatic mission, Adams was no longer engaged in "militia...