As some of you may already know, I normally do not consider the applicability of "canon" to the events described in the franchise as the main focal point of my experience but a recent discussion on YT about the Fall of Shady Sands triggered a thought I'd like to share.
Maybe it has been already discussed but here is my thought.
The Fall started in 2277, approximately when the Legion arrived in the Mojave, and ended shortly after the Second Battle of Hoover Dam, with the nuclear destruction of Shady Sands, So, basically, the decline of the NCR is happening at the very same time the Courier is roaming the Mojave and it ends after the completion of FNV game.
As NCR power vanishs after the Second Battle of Hoover Dam, it means they lost the battle: NCR ending is ruled out and cannot be canon.
The Legion is not mentioned during the Series events, not even once: to me it means their influence on the Mojave/California region is either minimal or null, therefore they haven't won that battle either. In addition, if the Legion would have had control over NV I'm sure it would have been the very last place on Earth for MacLean to go. Legion ending is not canon.
There are two option left: Mr. House is ruling the Mojave or NV is a free city under Yes Man watch.
As the pre-war facts suggested, Hank MacLean could even personally know Mr. House, then making NV the perfect place where to seek help, the former option is the one with higher probability to be canon.
What's your opinion?