THE NCR

The NCR aka New California Republic. This little group was started with the help of a Dweller from Vault 13.

New California^[1] (officially the New California Republic, often abbreviated to NCR) is a large, democratic federation of well over 700,000^[2] based in California, with holdings in Nevada, Oregon, Mexico (Baja California) and along the Colorado River. The NCR emphasizes and claims to support a myriad of old-world values, such as democracy, personal liberty, and the rule of law. It also strives to restore general order to the wasteland, the improvement and development of infrastructure and economic systems, and a basic common peace between the people. Though appearing to be a benevolent entity of governance, the ability to control the land it claims to protect, the fidelity of those who live under their rule, and the widespread corruption within their political system has been questioned by many, without a clear response by the NCR themselves. 

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Now here are some background info about them:

The New California Republic was born from the remnants of the survivors of Vault 15 and the small walled community they founded, Shady Sands. Under the leadership of Aradesh, and with the assistance of the Vault Dweller (who saved Tandi, Aradesh's daughter and a future president of the NCR), the community prospered. Trade routes with other settlements allowed cultural exchange, and a movement to form a national entity gradually took root and won popular acceptance.

In 2186, the town of Shady Sands changed its name to "New California Republic" and formed a trial council government to draft a constitution. Four more settlements joined the council, and in 2189, the NCR was voted into existence as a sprawling federation of five states: Shady Sands, Los Angeles, Maxson, the Hub, and Dayglow.

By post-apocalyptic standards, the NCR is a paragon of economic success and good ethical character: political enfranchisement, rule of law, a reasonable degree of physical security and a standard of living better than mere subsistence are daily realities for its impressive population of citizens.^[3]

Currently, the NCR is in a state of transition, with rapid economic growth and a series of changes in political leadership endangering its grand humanitarian ideals. Nowhere is this more evident than in the Mojave, where the occupation of Hoover Dam has improved access to electricity and water, but at the cost of straining its budget and embroiling its armed forces in a morally corrosive imperialist project.

The NCR government's aim is to annex New Vegas as the republic's newest state. While it already controls Hoover Dam, its treaty with Mr. House and the three families compel it to allocate 5% of the dam’s electrical and water production to local use free of charge. Adding insult to injury, the NCR is locked into protecting New Vegas from invasion by Caesar's Legion even as it receives not one cap in tax revenue from the Strip's highly lucrative resort operations. NCR citizens in the Mojave have largely come here for economic reasons, whether as paid citizen soldiers or as prospectors and fortune-seekers.

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Well that's all I have to say about that.