Guy Gardener wrote:
Natasha either had some Russian version of Nick Fury's Infinity Formula, or like her boyfriend "Bucky" she might have spent decades in suspended animation while she wasn't in use by the state... But as far as the comics are concerned, the Black Widow was conceived in the 1930s.
The Black Widow project was conceived during the Cold War. She was given the Infinity Formula by the Winter Soldier not long after the Claremont story.