Open Door Policy
Overview
 
The Open Door Policy is a concept in foreign affairs, which usually refers to the policy in 1899 allowing multiple Imperial powers access to China, with none of them in control of that country. As a theory, the Open Door Policy originates with British commercial practice, as was reflected in treaties concluded with Qing Dynasty
Qing Dynasty
The Qing Dynasty was the last dynasty of China, ruling from 1644 to 1912 with a brief, abortive restoration in 1917. It was preceded by the Ming Dynasty and followed by the Republic of China....

 China
China
Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

 after the First Opium War
First Opium War
The First Anglo-Chinese War , known popularly as the First Opium War or simply the Opium War, was fought between the United Kingdom and the Qing Dynasty of China over their conflicting viewpoints on diplomatic relations, trade, and the administration of justice...

 (1839-1842). Although the Open Door is generally associated with China
China
Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

, it was recognized at the Berlin Conference
Berlin Conference
The Berlin Conference of 1884–85 regulated European colonization and trade in Africa during the New Imperialism period, and coincided with Germany's sudden emergence as an imperial power...

 of 1885, which declared that no power could levy preferential duties in the Congo basin
Congo River
The Congo River is a river in Africa, and is the deepest river in the world, with measured depths in excess of . It is the second largest river in the world by volume of water discharged, though it has only one-fifth the volume of the world's largest river, the Amazon...

..
As a specific policy with regard to China, it was first advanced by the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 in the Open Door Notes of September-November 1899.
 
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