The period of the enactment of the Open Door Policy was done between 1899 - 1949.
What was the Open Door Policy?
This refers to the foreign policy of the United States to call for equal trade and also to protect the trading integrity of China.
Hence, we can see that this American policy was made and pushed by John Kay in order to protect China during the civil war period and was done by the Secretary of State, John Kay.
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