What factors ensured the victory of the Romans over the rebels?

In 74 BC, one of the largest slave uprisings began in Rome. This uprising was led by Spartacus himself, who was a gladiator from Capua. For several years, the army of gladiators was replenished with tens of thousands of slaves. True, in the end, the uprising was suppressed. The reasons for the suppression of the uprising were the advantage of the Romans in weapons, as well as in the professionalism of their army. Also, the reasons for the victory of the Romans were the fact that there was discord within the army of slaves.