Why was Theodore Roosevelt worried about
Japan winning the Russo-Japanese War?
O
A. Russia supported unlimited U.S. access
to Chinese markets.
O
B. Japanese victory could limit American
access to Chinese markets.
O
C. The U.S. had agreed to support Japan
in any war with European nations.
O
D. A treaty with Russia required the U.S. to
provide supplies to it during any war.

Theodore Roosevelt worried about Japan winning the Russo-Japanese War because, if Japan wins then it will limit the access of the Americans in the Chinese market. Therefore, B is the correct answer.

By 1904, Russia and Japan had been at odds for several decades over Manchuria's rule. The Russians had reached the region during the Sino-Japanese War of 1894–95, and were part of the "Triple Intervention," which forced Japan to abandon its aspirations for docks in South Manchuria and the Liaodong Peninsula following its victory in China.

Manchuria was promised to be evacuated by Russia and Japan. Japan thought it had won the war and that it should have gotten more in the peace. Roosevelt aimed to achieve a power equilibrium between the two territories. Many historians feel he was successful, at least for the time being. Roosevelt's actions also helped the United States gain more influence in international affairs.

Despite being encouraged by Japan's military advances, Roosevelt was concerned about the implications for US involvement if Japan were to completely expel Russia. The Russians decided to keep Sakhalin Island, declined to grant the Japanese a war expenses compensation, and kept their naval in the Pacific.

Learn more about this answer here:

https://brainly.com/question/13379434