Answer: Open Door.
Explanation:
In 1899, the U.S. Secretary of State, John Hay, issued a statement of principles proposing the Open Door policy to Great Britain, Germany, France, Italy, Japan, and Russia.
The Open Door policy was meant to protect equal privileges in the trade with China while preserving Chinese integrity. It was almost universally accepted and was a key element of the United States´ foreign policy in East Asia for decades.
