How was the united states involved in the russo-japanese war? a) president roosevelt negotiate peace. b) the united states fought on japan’s side. c) the united states fought on russia’s side. d) president roosevelt convinced britain to stay neutral.

The correct option is "A) President Roosevelt helped negotiate peace."

The russo-japanese war ends with the Treaty of Portsmouth, which was mediated by then-U.S. President Theodore Roosevelt, and signed on September 5, 1905. Roosevelt later won the Nobel Peace Prize for his participation in these negotiations.

explanation:

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