<span>The purpose of the Open Door Policy was to give all nations equal rights when trading with China, according to the Encyclopaedia Britannica. It was initiated by the United States and aimed to both enhance global trade and to promote China's welfare and sovereignty.</span>
Answer:
the Adams-Onís Treaty
Explanation:
In 1819, The Adams-Onís Treaty defined the boundary between the U.S. and New Spain to prevent war.
