The Facebook page of the our Embassy to the Holy See is often more interesting and updated a tad more often then the offical web page. Our Embassy takes note over at Face book of an interesting point of American History. That is when the Successor of Peter Benedict XVmet in person the President of the United States for the first time.
At that last link ( in case they decide to take facebook down and to keep track of the documents links) :
President Wilson’s physician Cary T. Grayson accompanied the President on all of his trips and kept a diary of the activities. For the detailed entries of President Wilson's meeting with Pope Benedict XV, see http://wwl2.dataformat.com/Document.aspx?doc=28306 and http://wwl2.dataformat.com/Document.aspx?doc=27783 from the Woodrow Wilson Presidential Library.