It has been a long 77 years since the defeat of the master and his army. The Vault Dweller, believeing that a new period of hope and peace had been ushered in, passed away with a clear concience.
But war, war never changes.
In 2238, the northern cities are in perpetual anarchy. Factional control is in a constant state of change, with no peace within sight. Block by block, room by room, the fighting is brutal. The horrors of urban combat, not seen since the days of the great war, is considered part of daily life.
In the south, the NCR has grown decadent. After years of un-interrupted rule, it vainly continues its expansionist goals. However, they are on the brink of civil war.
The Brotherhood Of Steel and the Enclave, continue to operate. Unfortunately, their policies of isolation have left them with no armies to execute policy. Their high technology, left un-used in their armories. With their fall came the rise of other gangs. They too, are now just pieces, to the chessboard of the wastes.
Meanwhile in the East, a new powerful faction has emerged. Taking their name from an empire of old, they plan on orchestratng a new genocide. Plans have been made to take what the NCR cannot hold onto.
A new apocalypse has been ushered in. How will you survive?
Just my take on Reinats contribution. I like how it is closer to the intros from 1 and 2, with mention to the previous Fallouts.