Looking the Fallout timeline Fallout New Vegas is only three years after Fallout 3, Not really a complaint but just a curious question. Why a nine year gap rather then three?
[ From the Fallout wiki - http://fallout.wikia.com/wiki/Timeline ]
2278
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The Lone Wanderer embarks on a search for a Garden of Eden Creation Kit. -
A steamship, the Duchess Gambit, travels down the River Potomac and docks to the southeast of Alexandria Arms in the Capital Wasteland. The ferryman offers wastelanders a chance to travel to Point Lookout. The Lone Wanderer embarks on a journey to seek out pre-War treasures, but instead discovers a feud between two parties from before the War.[85] -
The Earth is saved by the Lone Wanderer from an alien threat when they are captured in the northern Capital Wasteland by an alien mothership named Zeta, taking the control of the ship with an atypical group of survivors from Earth's past, and destroying another alien mothership which was near Zeta.[86] -
Fallout 3 ends - The Lone Wanderer activates Project Purity, either with or without the modified Forced Evolutionary Virus of the Enclave and the Capital Wasteland was changed forever. Raven Rock and Adams Air Force Base are destroyed, and the Citadel may also be destroyed (depending on the Lone Wanderer's actions). The Capital Wasteland Brotherhood of Steel begins to distribute Aqua Pura to a thirsty Capital Wasteland. -
Tabitha gathers a group of Mariposa super mutants and establishes the State of Utobitha at the Black Mountain radio complex.[41] -
The NCR massacres dozens of Great Khans at Bitter Springs.[55] -
Following the abduction and killing of four soldiers, NCR troops assault the Great Khans' settlement at Red Rock Canyon and massacre several dozen men, women, and children. This event goes unreported in NCR press.[55]
2281
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New Canaan is destroyed by the White Legs in an attempt to gain enough favor with Caesar's Legion to be assimilated. The surviving residents of New Canaan are scattered across Utah. -
Benny, Jessup, McMurphy, Chance and several other Great Khans travel out into the Mojave Wasteland to ambush the Courier carrying the Platinum Chip. -
October 11: Fallout: New Vegas intro - The Courier is ambushed and shot in the head by Benny, left for dead in a shallow, unmarked grave in Goodsprings Cemetery. Victor finds the body and retrieves it, and the Courier makes a miraculous recovery in the care of Doc Mitchell.