stylistic:tone
Social troubles and first civil war

Views on the structural causes of the Republic's collapse differ. One enduring thesis is that Rome's expansion destabilized its social organization between conflicting interests; the Senate's policymaking, blinded by its own short-term self-interest, alienated large portions of society, who then joined powerful generals who sought to overthrow the system. Two other theses have challenged this view. The first blames the Romans' inability to conceive of plausible alternatives to the traditional republican system in a "crisis without alternative". The second instead stresses the continuity of the republic: until its disruption by Caesar's civil war and the following two decades of civil war created conditions for autocratic rule and made return to republican politics impossible: and, per Erich S. Gruen, "civil war caused the fall of the republic, not vice versa".

A core cause of the Republic's eventual demise was the loss of elite's cohesion from c. 133 BC: the ancient sources called this moral decay from wealth and the hubris of Rome's domination of the Mediterranean. Modern sources have proposed multiple reasons why the elite lost cohesion, including wealth inequality and a growing willingness by aristocrats to transgress political norms, especially in the aftermath of the Social War.