The American companies have made a great effort. They have speeded up production, raising it from 376 million barrels in 1919 to 443 million in 1920. New exploratory work has been carried on, especially in Texas and Kansas. But will not this hasten yet more the time when the resources of the United States will be exhausted? At the word of command from the United States Government, "Draw more and more on the oil in foreign countries," the _Standard_ sent out prospectors all over the world. But everywhere they ran up against an unforeseen obstacle. An American prospector had the misfortune to appear on the shores of the Dead Sea in October 1919. Without hesitation the British General who was Governor of Palestine had him arrested in Jerusalem. To the indignant protests of President Wilson Britain simply replied that it was not a question of measures aimed specially against the Americans, but that all prospecting in Palestine was forbidden until a new order. The same thing happened in Mesopotamia. Everywhere in the world, except possibly Canada, in which country they have considerable influence on account of their geographical proximity, the Americans for two years found the "closed door."[31] Generally they were either completely excluded from oil-bearing concessions situated in the territory, the colonies, or even the sphere of influence of Great Britain, Japan and the Netherlands; or else they were authorized to establish themselves only under such conditions that they would lose the effective control of their undertakings. Foreigners are forbidden to prospect for oil in Burma, India, Persia, Uganda and the United Kingdom. A policy which _excludes foreigners from the control_ of petroleum products is followed in Algeria, Australia, Barbados, Kenya Colony, British Guiana, France, French West Africa, Guatemala, Japan, Formosa, Saghalien, Madagascar, Mexico, New Guinea, and probably in the Union of South Africa. Venezuela and Uganda are considering a similar policy. The _right to exploit mineral wealth_ cannot be granted to foreigners in Australia, Barbados, Kenya Colony, New Guinea, the Dutch Indies, France, French West Africa, Guatemala, India (probably), Great Britain, Japan (practically), Trinidad (in part), Venezuela, Madagascar, and, except for rights already acquired, in Rumania and Slovakia. Temporary restrictions have been placed on the acquisition of oil concessions by foreigners in two districts of Colombia and in the new Rumanian territory.