Which policy was pursued by President McKinley to ensure access to China's markets?

The Open Door policy was pursued by President McKinley to ensure that the United States would have equal access to China's markets. This policy emerged in response to the growing sphere of influence exerted by various European powers in China during the late 19th and early 20th centuries.

By advocating for the Open Door policy, McKinley aimed to prevent any single nation from monopolizing trade in China, thus allowing the U.S. to participate fully in the lucrative trade opportunities that the Chinese market presented. The essence of this policy was to promote free trade and ensure that all trading nations would have the opportunity to pursue their commercial interests without the threat of exclusion or domination by stronger powers.

This approach reflects the broader goals of American imperialism during this period, which sought not just territorial expansion but also the establishment of economic influence and trade relationships in regions considered vital to U.S. interests. The Open Door policy is particularly notable for exemplifying how the U.S. engaged in foreign relations and commercial diplomacy, setting a precedent for future interactions in Asia.

In contrast, dollar diplomacy pertains to the use of financial investments to extend American influence, while the Roosevelt Corollary expanded on the Monroe Doctrine and was focused on Latin America and not specifically on China