what did secretary of state John Hay call for in the Open Door Policy

Answer 1

There is quite a lot of information on the Open Door policy and its development at these sites:

http://www.encyclopedia.com/doc/1E1-OpenDoor.html

http://www.answers.com/topic/open-door-interpretation

http://encarta.msn.com/encyclopedia_761560219/Open_Door_Policy.html

http://www.kqed.org/w/pacificlink/history/usforeignpol/