What were the effects of US intervention in the Russo-Japanese War?

The United States did not provide Japan with supplies or military advisors, and it did not support Russia against Japan. Instead, President Theodore Roosevelt helped negotiate the Treaty of Portsmouth in 1905, which brought the war to an end. The successful mediation increased U.S. influence in international affairs, so the correct choice is C: Roosevelt’s effort to negotiate a peace treaty ended the war and increased US influence.

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