I would say B, not 100% sure
The Russo-Japanese War was a war between the Japanese Empire and the Russian Empire. It started in 1904 and ended in 1905. The Japanese won the war, and the Russians lost. The war happened because the Russian Empire and Japanese Empire disagreed over who should get parts of Manchuria and Korea.
An appalling of black codes and other racist laws/acts as well as adding the 14th amendment which gave African Americans a vote.
Hope this helps
Lincoln means that the soldiers were willing to die, to give their lives out of love and devotion