What single event started a chain of events leading to the war

         However, there was one single event, the assassination of Archduke Ferdinand of Austria, which started a chain of events leading to war. In the years leading up to the war, the nations of Europe were constantly jockeying for power and making alliances. Germany made an alliance with Austria-Hungary and Italy in 1881.

Explanation:

        For example. The chain reactions in history are how one event led to another. For example, the assassination of Franz Ferdinand led to World War 1 because when Austria declared war on Serbia. ... Dividing Europe into two hostile sections and creating a huge international war.

wealthy plebeians became part of the roman nobility. however, despite changes in the laws, the patricians always held a majority of the wealth and power in ancient rome. a third social class in roman society was the slaves. around one third of the people living in rome were slaves.

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if you are talking about current time the answer is no

if you are talking about when the colonies were developing the answer is yes