There is a solidarity and interdependence about the modern world . . which makes it impossible for any nation completely to isolate itself from economic and political upheavals in the rest of the world, especially when such upheavals appear to be spreading and not declining. . international anarchy destroys every foundation for peace. it jeopardizes . . the future security of every nation, large or small. it is, therefore, a matter of vital interest and concern to the people of the united states that the sanctity of international treaties and the maintenance of international morality be restored. —president franklin d. roosevelt, 1937 president roosevelt later used similar reasoning as one justification for —