The policy is known as the "Open Door Policy."
John Hay created this idea in hopes that America and countries all over Europe could trade peacefully with China. This concept was developed in order to protect America's trade interests while also ensuring that no other country would establish a monopoly on trade with China. Within this policy, all countries would agree not to interfere with another country's trade with China.
B.) allowing states to decide on the slavery issue
Explanation: He did everything else but allowed states to decide. This was because if he did let the states decide they wouldn’t want slavery demolished. Also I remember this stuff from 5th grade and I’m a nerd lol