(b) The term "sphere of influence" has been used since the Berlin Conference, 1884-1885, to indicate a sort of attenuated protectorate in which the aim is to secure the rights without the obligations. First applied to Africa in the partition of the unexplored interior among the European powers,—Great Britain, Germany, France, Italy, Portugal,—it has since been extended to other regions. This doctrine of mutual exclusion of each from the "spheres" of all the others cannot be held to bind any states not party to the agreement.
The method of exercise of "influence," while varying, usually consists in making with the native chiefs treaties which convey privileges other than the cession of sovereignty. These privileges are often commercial, and may be with the state direct or agreements with some company to whom the state has delegated a portion of its authority, as in the African trade companies.
The "spheres of influence," gradually with the growth of power of the influencing state and the necessity of protecting the "sphere," against other states, become less vague in their relations to the influencing state and merge into protectorates or some other more stable condition.
This "sphere of influence" idea, as well as the "Hinterland Doctrine," can be of only temporary importance, owing to the limited area still open to occupation. It is maintained that within the "sphere" the influencing state has jurisdiction to the exclusion of another state, and that it has a right to occupy the territory later, if advisable. The influencing state disclaims all obligations possible.[133]
[§ 49. Maritime and Fluvial Jurisdiction]
Wheaton states as a general principle of maritime and fluvial jurisdiction, "Things of which the use is inexhaustible, such as the sea and running water, cannot be so appropriated as to exclude others from using these elements in any manner which does not occasion a loss or inconvenience to the proprietor."[134] While the tendency of international policy is toward unrestricted freedom of river navigation, yet the principle as enunciated by Wheaton cannot be said to be established in practice. The American and Continental writers have generally favored the principle enunciated by Wheaton. English writers have contended against this position as a right, but admit that the principle is becoming established by numerous treaties and conventions. As to the sea, the principle may be said to be established.
[§ 50. Rivers]
The jurisdiction of rivers is a question which is not identical with the right of navigation of rivers, and may best be considered apart. The question of jurisdiction is one of general international principle, while the question of river navigation is one of particular provision, in many instances.
The rivers fall under three classes:—
1. Rivers which traverse only one state.