I was playing New Vegas and i was wondering if Mr. House is truly the best person for New Vegas? He genuinely cares about Vegas and has done the most work in bringing it back from the dead and taking care of it.
Past.
Mr. House Knew the world would end he knew he couldn't save the world, nor did he want to but, he could save Las Vegas.
"On October 23rd 2077, the citizens of Las Vegas bore withness to an astonishing spectacle. Huge Laser cannons unfreled from the secret housings in the roof of the Lucky 38 casino and hoover Dam's Intake towers and began spitting blasts of green fire into the sky, destroying warhead after warhead and sparing Las Vegas." - Fallout New Vegas Offical Game Guide
Not only did he save Las Vegas but the Mojave aswell.
Though Defending Las Vegas from atomic destruction set off cascade of system crashes that pluged the Lucky 38 into darkness and nearly killed Mr. House. This proved too much for Mr. House and he lapsed into a coma. When Mr. House Finally came to, decades had passed. Immediately he began using his Securitron robots to search out human settlements, and eventually he was able to hire salvage teams in the distant west to search for the priceless upgrade disc in the ruins of Sunnyvale. The disc would not be found until many years which he spent millions of his own caps to ensure that New Vegas would one day have an army capable of protecting it. In the meantime he would improvise adhoc defense of the vegas region against the encroachment of NCR forces, namely the recruitment of the Three Families and to augment his downgraded Mark 1 Securition robot defenders.
He managed to negotiate with the NCR to allow Power and Water to run into the strip and recognizing Mr. House and his stewards, the Three Familes as the rightful owners of New Vegas, So with that Vegas or at least a fraction of it was back from the dead. The citizens of New Vegas build a wall around Vegas to protect it from raiders and invaders andThe Strip was open for buisness.