Why was the open door policy supported by the US often opposed by most imperialist nations?

The Open Door Policy, advocated by the United States in the late 19th and early 20th centuries, aimed to ensure equal trading rights for all nations in China, preventing any single power from monopolizing the market. Most imperialist nations opposed it because they sought to expand their own influence and control over territories, including China, and preferred exclusive rights to resources and markets. This conflict of interests highlighted the tension between U.S. ideals of free trade and the imperial ambitions of other nations. Ultimately, the policy reflected America's desire to protect its economic interests without engaging in territorial conquest.