Question

What was one effect of the Russo-Japanese war (1904-1905)?

Answer 1

One of the effect was Japan emerged as a world power on a major scale. 

The russo-Japanese war was a battle between Russian and Japanese Empire over the control of Manchuria and Korea.
The Russian lost several decisive battles against Japan because they underestimated their capabilities.

Answer 2

Japan gained influence in nations such as Manchuria and Korea.