Remember folks, it is about respecting each other here, flame wars and drama do not solve anything.
That being said, all of the Fallout games are about rebuilding civilization, Canon sources are about how things are rebuilding after how things were screwed up during the Resource Wars, how the US Government was playing God with the F.E.V., and how we almost exterminated each other on October 23, 2077. Being so, it is not the Graphics, or the Games themselves, it is the writing, and the creative minds behind the games that is the true start to Fallout, the games and materials that have been added after, Canon or not, are there to add to the experience. Where would the NCR, or the Brotherhood of Steel, or Caesar's Legion be without the creative minds of the people who write the material. Without them, we would never have gotten the tale of the Vault Dweller, who kicked the ass of a madman who was forcing peace onto others through forced evolution, or the Chosen One, who ended the machinations of a corrupt government in hiding, or the Lone Wanderer who was willing to die in order to bring hope and water to those who had none, or the Courier who started as a corpse, and ended up making a difference to a region for decades to come because of his actions at Hoover Dam.
It is the Stories and the Writers that make the wasteland or the country, and in all of the games, it could be said the West( or the East) could be a Post Nuclear America, or a third world country, it depends on the perspective of the viewer in the end to make that judgement, myself, i think FO is post nuclear due to the era it was in, FO2 was a mix, as was FO3, but because of Mr House, IMHO, F:NV is more Third world due to the fact that he was able to save the majority of the Mojave from the Bombs and Warheads that was suppost to hit there, and compared to the rest of America, while there is some areas that is Radioactive in the Mojave, it is mostly just dry desert conditions and clean water, and that to me says it is more third world and livable than post nuclear. That is my Two cents on the topic at least....
In closing, remember, play nice, respect each other, and without rich deep stories and writing, and Canon sources from the creators, these games would not have gotten to be as popular as they have been.