Final answer:
The United States was interested in trade markets in China when the "Open Door Policy" was created in 1899.
Step-by-step explanation:
The "Open Door Policy" created in 1899 was driven by the United States' interest in trade markets in China. The policy aimed to ensure that all countries had equal access to commercial opportunities in China, which was a significant market for American goods. The United States wanted to establish fair trade practices and prevent other major powers from dominating the Chinese market.
Learn more about Open Door Policy and United States' interest in trade markets in China