[i truly wonder what events *wouldn't* fall under a category that is as inclusive as "civil wars, civil unrest, and continued broken faith and trust in the senate and people's assembly". The "80 years" is completely superfluous, and you could just as well make it 8, 80, 800, or 8000 years given how nebulous your category is.]
Nothing superflous about the number 80 or the nebulous about the category. 135-45 BC is quite different from 215-135 BC. In 134-45 the Republic fails to adequately deal with the string of individuals and military leaders (patricians and new men, optimates and populares) who contributed to its demise.