One reason for the success of the cities in the hanseatic league and the italian city-states were that both were accessible by water.
By 334 BC there were 7 warring states: Qin, Chu, Zhao, Wei, Han, Yan, and Qi. The Warring States Period ended with Qin's conquest of the other states. It was succeeded by the Qin Dynasty in 221 BC, which marked the transition between ancient China and Imperial China.
The Union victory did solve a handful of problems, it abolished slavery and get rid of the Confederate Union but not every problem could be solved. Personally I would disagree because the Civil War had other problems right after because of the victory.
