Disputes arising from these economic causes are even deeper seated and more dangerous than those connected with the claims of nationality and autonomy. Indeed, political autonomy is shorn of most of its value unless it is accompanied by a large measure of economic liberty as regards commercial relations with the outside world. The case of Serbia, liable at any moment to be denied access to the sea, or to be cut off by Austria from her chief land markets, is a case in point. Or once again, would the autonomy of such a country as Hungary, Bohemia, or Poland, however valid its political guarantees, satisfy the legitimate aspirations of its population if high tariff-walls encompassed it on every frontier? Such instances make it evident that no settlement of “the map of Europe” on lines of nationality can suffice to establish peace. The effective liberty of every people demands freedom of commercial intercourse with other peoples. A refusal or a hindrance of such intercourse deprives a people of its fair share of the common fruits of the earth, and deprives the other peoples of the world of any special fruits which it is able to contribute to the common stock. If any international Government existed, representing the commonwealth of nations, it would seek to remove all commercial restrictions which impair the freedom of economic intercourse between nations. These restrictions are placed by the Reform Club Memorandum under the four following categories:— First. There is the restriction of tariffs imposed by nations. Second. There are restrictions upon the best uses of International commerce, of the terminal and land transfer facilities of the great trade routes and seaports of the world. A few such ports command entrance to and exit from vast continental hinterlands. It is vital to these interior regions that their natural communications with the outside world should be kept widely open, and this is equally vital to the rest of the world. Obstructive control of such ports and routes to the detriment of the world’s commerce cannot and should not be tolerated by states whose interests are adversely affected. But routes and ports are needed for use, not government; and port rivalries constantly tend towards offering the best and equal facilities to all. The swelling tides of commerce are clearing their own channels, and mutual interests will more and more prompt the states through which the principal trade routes pass to facilitate the movement of commerce.