It's a spoiler that is vastly known already, but none the less you asked for a non-spoiler which is very hard to do when asking about a character's back story.
Spoiler
He had something to do with the bombs not destroying Vegas completely...
Cue Col. Martyr post about how awesome Mr. House is in 3...2...1... :frog:
He's so awesome Chuck Norris cries himself to sleep every night because he's not as awesome as Mr. House. Chuck Norris can never win over Mr. House because The House ALWAYS win B)
He's so awesome Chuck Norris cries himself to sleep every night because he's not as awesome as Mr. House. Chuck Norris can never win over Mr. House because The House ALWAYS win B)
You aren't Col. Martyr! Now leave before he gets here. :ph34r:
Caesars legion are slavers and NCR are not well organized so there is a great reason to choose house because he owns Vegas and the Hoover Dam practically