Eventually , after finding Benny and the Chip , the Courier finds him/herself in the middle of a conflict between three major factions : Caesar 's Legion , a group of Roman-esque slavers , the New California Republic ( NCR ) , an expansionist militia government , and Mr. House ( voiced by René Auberjonois ) , the enigmatic de facto ruler of New Vegas , in command of an army of Securitron robots that patrols the city .
An expansionist country is one of the factions in Fallout : New Vegas .