NOTE: I don't own any of the source material, only my original characters. All source material is owned by their respective copyright holders.
The Second Battle for Hoover Dam had come and gone, with only one clear victor. The Courier, with his army of Securitrons, wiped the Legion from the Mojave and pushed the NCR back west. New Vegas would remain independent and a place where fortunes could be won and lost in the blink of an eye…
The Legion scattered back east into Arizona. Leaderless after the deaths of Caesar and the Legate, they began to fight among themselves as several different warriors attempted to gain control. The fighting was brutal, even by their standards, and none that entered Arizona were heard from again.
The NCR, despite being unhappy with events, created an alliance with the Courier. They kept their embassy on the Strip but were forced to leave Camps McCarran, Golf, Guardian, Searchlight and Forlorn Hope. Companies, such as the Crimson Caravan, were also allowed to continue operating and the Mojave provided them with many new opportunities, both within and beyond Nevada.
The Brotherhood used the battle as an opportunity to re-capture HELIOS One but, with their newfound truce, they allowed the NCR to leave peacefully. Shortly after their patrols began appearing on major roads, harassing travellers over technology deemed "inappropriate". While the Courier did not like this, he allowed it to continue under the condition that the Strip and Freeside continue to be supplied with power from the solar station. Veronica stayed with them, helping to promote the relationship between the Brotherhood and the Courier, though she would forever feel a distance between her and the only family she had ever known.
Super Mutant attacks lessened following the discovery of the cure for the Nightkin schizophrenia. Jacobstown became a beacon for mutants everywhere, especially after Tabitha and Rhonda disappeared into Arizona and left Black Mountain uninhabited. Marcus and the Courier became friends, and he spent many a night regaling the Courier with tales of the Chosen One…and even a few of the Vault Dweller, among others.
Freeside remained much the same. The relationship between the Courier and the King was so strong that the Kings were named as the official caretakers of Freeside, a role they took very seriously. Old Mormon Fort also continued its work, despite several of its members leaving following the battle. They would later meet up with the Great Kahns in Wyoming and begin carving out a new empire.
Arcade found himself torn between two duties; to his new family in the Mojave and to his old Enclave life. With the Remnants disappearing he became stuck in an emotional limbo, using the knowledge and technology he had gotten from them to help the Followers and Freeside but always feeling a certain distance between him and those he tried to help.
Boone, having come to peace with the death of his wife and the events of Bitter Springs, became a scout and caravan guard under the employ of the Courier. While a part of him wished to rejoin his old unit, he found himself unable to leave the land of his wife.
Cassidy began trading again, heading as far north as New Canaan. She never saw the Courier again and she spent many nights awake, wondering where he was and what he was doing. It was her only regret when the end came.
Raul came to terms with his age but moved on regardless. The Courier never saw him again, but heard tales of a ghost that haunted the plains of Oregon, dispensing justice to the evil strong. They always made him smile.
Chief Hanlon retired, frustrated at the pointlessness of the Mojave campaign. With the NCR Rangers gone the Desert Rangers began once again and, in union with both the Courier and the Brotherhood, patrolled the roads that crisscrossed the countryside. They were a bastion of hope for wastelanders everywhere, which still regarded the Brotherhood and Securitrons with suspicion or disdain.
With relative peace across the Mojave, the Courier found himself with nothing left to do. Yes Man took care of the day to day duties and the Courier found himself getting restless, dreaming of another war. Luckily (or unluckily) for him, one was just arriving on his doorstep…