"At the time when the Government of the United States was informed by that of Germany that it had leased from His Majesty the Emperor of China the port of Kiao-chao and the adjacent territory in the province of Shantung, assurances were given to the ambassador of the United States at Berlin by the Imperial German minister for foreign affairs that the rights and privileges insured by treaties with China to citizens of the United States would not thereby suffer or be in anywise impaired within the area over which Germany had thus obtained control."
John Hay, "First Open Door Note", September 6, 1899
The policy described in the excerpt was most directly a reaction to the
Rising tensions between the U.S. and Japan over the annexation of the Philippines
Division of China into spheres of influence by European powers
Growing Chinese influence over Western economic markets
Military defeat of Britain in the Opium Wars
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