What was the purpose of the door policy that secretary of state john hay proposed in the late 1800

Open Door Policy initiated in 1899/1900

Explanation:

protection of equal privileges for countries trading with China that were in support of Chinese territory and administrative integrity. 

40 yrs the cornerstone of American foreign policy

it was made because he wanted to try to make people convert as well people who would have read or studied this item at the time it was created were probably people who wanted to change religions who thought conversion was a good idea.