The Ottoman economy was disrupted by inflation, caused by the influx of precious metals into Europe from the Americas and by an increasing imbalance of trade between East and West.
Its The Spanish-American War of 1898
The main political unit that emerged in the world is A. the state. A state is defined as a territory or land in which a defined number of constituents is ruled over a governing body that follows and implements a system without following necessarily a superior power. I think this is powerful enough.
The Civil War started because Abraham Lincoln was against slavery even though he had slaves and plus it also happened because of him signing the Ammendment of being against slavery even though he still had slaves.