Their Constitution was based on working together, since the tribunes of the plebs could veto anything and only the Assembly passed the laws after the LEx hortensia, if there was ever any legislation that was unfavorable to a group then all the government would need to come to some kind of consensus. The problem was after the 2nd punic war all the individual farmer solider's farms had laid fallow and allowed to be over gornw since they could not return to thier farms as long as Hannibal was roaming about Italy. So alot of the individual farms were bought up by rich men who manned them with slaves, putting thousands of rural poor in the mood to travel to rome and become the thousands of urban poor. This led to a bit of rabble rousing, but it also led for the need for change, Which the romans were always agasint intiallty (at least the upper crust of Roman society). Then you have the gracci brothers and Caesar come in and try to change things. But its not so much what they tired to change as how they tried to change it. They broke traditions and caesar went so far as to call teh republic a dead body. THough it was, he seemed a bit out of it to the Romans. Plus during all these time u have about 100 years of civil war, which shows how the Roman constitution was great for a city state of about 50,000 but not the capital of an empire. So basiaclly the Republic became ineffeicient and the men who tried to change the republic for the good ended up making it destroy it self.