Final answer:
Julius Caesar gained control of Rome after his successful military campaigns and being appointed as dictator for life.
Step-by-step explanation:
Julius Caesar was able to gain control of Rome after his successful military campaigns and being appointed as dictator for life. He gained popularity among the Roman people for his military conquests, particularly his campaigns in Gaul and his plans to launch an invasion of Persia. Caesar also made political alliances and filled the senate with his supporters to consolidate his power and establish a new version of the Republic that answered directly to him.