AP US History
The U.S.'s open door policy was a diplomatic principle aimed at ensuring equal trading rights for all nations in China, proposed by Secretary of State John Hay in 1899. This policy sought to prevent any single nation from monopolizing trade with China and promoted the idea of maintaining China's territorial integrity while allowing multiple nations access to its markets. It was significant for establishing the U.S. as a key player on the world stage and highlighted America's emerging role in global affairs during the early 20th century.