There were several factors that contributed to the decline of the Old Kingdom, but the most important issue was the erosion of the authority of the Pharaoh and the accompanying growing power of the nobility and priesthood. This led to the decentralization of power in Egypt and constant power struggles and civil war.
The 24 president of the United States was Grover Cleveland.
Russia I believe. They beat Russia in the Russo-Japanese war. Check out "Feature History" youtube channel for more info. Just type Russo-Japanese war into youtube and it should pop up. Hope this helps.
Although your question is incomplete, I would guess B. African Americans.