A brief allusion to the other side of the objection will suffice, viz., the fact that any such boycott would be far less potent or immediate in its pressure against some nations than against others. While Great Britain would have to yield at once to the threat of such pressure, Russia, or even the United States, could stand out for a considerable time, and China might even regard the boycott as a blessing. But it is pretty evident that in the long run no civilized nation could endure such isolation, and that this weapon is one which the League might in certain cases advantageously employ. [Sidenote: Other difficulties.] Other aspects of the social-economic boycott raise other difficulties. While certain modes and paths of intercourse lie directly under the control of the Governments of the cooperating States, others belong to private enterprise. Though postal, railway, and telegraphic intercourse could be cut off easily by agreements between Governments, private trading could not so easily be stopped. It is not found a simple matter to stop all trading between members of nations actually at war when national sentiment sides strongly with the legal prohibition. It might be much more difficult to prevent all commercial intercourse for private gain when there was no special hostility between the two nations in question. But this is, after all, only a minor difficulty. Provided that the respective Governments were prepared to use their normal powers of control over the principal modes of communication and of transport, the potency of the boycott so established would appear exceedingly effective. It involves, however, a risk which needs recognition. The extreme pressure of the boycott might lead to forcible reprisals on the part of the boycotted State which would, in fact, precipitate a war. Declaring what would be in effect a blockade by sea and land, it might be necessary for the League to patrol the seas in order to stop “illegal traffic,” and to keep some force along the land frontiers for general purposes. A boycotted nation might, in the stress and anger of the case, begin hostilities against those of its neighbors who were most active in the operations of the boycott. In that event the economic boycott would have to be supported by armed pressure. This would also be the case where the breach of international law against which action was taken consisted, not in refusing to arbitrate or conciliate an issue but in an actual opening of hostilities. Such an act of war, directed necessarily against some one or more States, could not be met merely by a boycott. It would involve armed cooperation as well, the economic boycott forming an accompaniment. [Sidenote: International Bank would strengthen League.]