What happened? What changed? What event or force was strong enough to act as an anchor against the tide of history for that long?
In Fallout's timeline, was there no Pill, no sixual revolution? Did women remain confined to the kitchen?
Was there no Civil Rights movement, and did Jim Crow rule over the South for another hundred years? (Note that all of the faces in the ads are white. Every one.)
The "current" society in the games seems about as egalitarian as our own, but did things not change until after the Great War, when every hand was needed for survival and the ghouls provided a new Other to hate and discriminate against?
Was there a Korea, a Vietnam? Was the United States of Fallout always giddily and brazenly imperialistic, and did it manage to avoid the discouraging losses that came later and cast a shadow over our national will for over a decade?
What happened to the USSR, the other and perhaps even scarier bogeyman of the '50s? Did they fall apart on schedule in the late 20th century, sometime in the 21st, or not until the bombs started flying? Did China destroy them before turning their eyes to the US?
Maybe I'm taking this too seriously, asking questions that a game was never supposed to answer. I'm just trying to make sense of something that may not have any.