In the 1860s, most factories were located in the North of the United States, mostly because the South was largely agricultural and remained this way for many years.
According to Eugene Debs and several other thinkers, the main problems that socialism will resolve are social inequality and corporate greed, although these views are highly contested in the western world.
Rome's rivalry with Carthage for control of the western Mediterranean
"Word of mouth" should be your answer. This question has many answers though.
Answer: Powder Keg of Europe.
Explanation: This is due to numerous nationalistic movements against colonial powers, Austria-Hungary and the Ottoman Empire.