The main reason why the US joined the war was because multiple attack on passenger and merchant ships with submarine attacks .The final straw was when the RMS Lusitania by a German u-boat going to Liverpool England .
The empire began to weaken after Rome conquered Egypt and eventually collapsed sometime in the 300s CE. The Kingdom of Kush had two different capital cities. The first capital was Napata. Napata was located along the Nile River in Northern Kush.
Without big farms to run, the people in the North did not rely on slave labor very much. In the South, the economy was based on agriculture. ... The North wanted the new states to be “free states.” Most northerners thought that slavery was wrong and many northern states had outlawed slavery.
Even if the United States had wanted to enter the war, its military force was simply not ready.