Editing Open Door Policy (section)

== Background ==
The theory of the Open Door Policy originated with British commercial practice, as reflected in treaties concluded with the [[Qing dynasty]] China after the [[First Opium War]] (1839–1842) which included [[most favored nation]] provisions designed to keep any one nation from gaining an advantage. The concept was seen at the [[Berlin Conference]] of 1885, which declared that no power could levy preferential duties in the [[Congo (area)|Congo]]. As a concept and policy, the Open Door Policy was a principle that was never formally adopted via treaty or international law. It was invoked or alluded to but never enforced as such. The policy collapsed in 1931 when the Japanese [[Japanese invasion of Manchuria|seized]] and kept [[Manchuria]], despite international disapproval. Technically, the term Open Door Policy is applicable only before the founding of the [[People's Republic of China]] in 1949. After [[Deng Xiaoping]] took power in 1978, the term referred to China's policy of opening up to foreign business that wanted to invest in the country, which set into motion the economic transformation of modern China.{{citation needed|date=December 2020}}
[[File:Fair field and no favor.jpg|thumb|upright=1.0|Uncle Sam (United States) rejects force and violence and ask "fair field and no favor," equal opportunity for all trading nations to enter the China market peacefully, which became the Open Door Policy. Editorial cartoon by [[William A. Rogers]] in ''[[Harper's Magazine]]'' (New York) November 18, 1899.]]