Universal Postal Union, [613]
Universal Telegraph Union, [614]
Usage, international, in contradistinction to international custom, [22]
Usurper, 427
Utrecht, Peace of, [63], [278], [583]
V
Vaderland, case of the, [357]
Vassal States, [140]
cannot be parties to offensive alliances, [142], [597]
cannot cede territory without consent of suzerain, [286]