noun
open door policy
Refers to the historical policy of equal trading rights in China, or more broadly any policy of open access.
19世紀末、アメリカは中国に対して門戸開放政策を主張した。
At the end of the 19th century, the United States advocated an open door policy toward China.
Compound of 門戸 (gateway) + 開放 (opening) + 政策 (policy), a calque of English 'open door policy'.