There are certain things so obvious as to seem commonplace, which, nevertheless, must be kept constantly before us if we are to preserve our just sense of proportion. This twentieth century is big with the fate of the nations of mankind, because the fate of each is now interwoven with the fate of all to a degree never even approached in any previous stage of history. No better proof could be given than by this very exposition. A century ago no such exposition could have even been thought of. The larger part of the territory represented here to-day by so many free nations was not even mapped, and very much of it was unknown to the hardiest explorer. The influence of America upon Old World affairs was imponderable. World politics still meant European politics. All that is now changed, not merely by what has happened here in America, but by what has happened elsewhere. It is not necessary for us here to consider the giant changes which have come elsewhere in the globe; to treat of the rise in the South Seas of the great free commonwealths of Australia and New Zealand; of the way in which Japan has been rejuvenated and has advanced by leaps and bounds to a position among the leading civilized powers; of the problems, affecting the major portion of mankind, which call imperiously for solution in parts of the Old World which, a century ago, were barely known to Europe, even by rumor. Our present concern is not with the Old World, but with our own Western Hemisphere, America. We meet to-day, representing the people of this continent, from the Dominion of Canada in the north, to Chile and the Argentine in the south; representing peoples who have traveled far and fast in the last century, because in them has been practically shown that it is the spirit of adventure which is the maker of commonwealths; peoples who are learning and striving to put in practice the vital truth that freedom is the necessary first step, but only the first step, in successful free government.