I need clarification of the significance of quantum theory to determining 
the *past*. I remember having read or heard that the past itself is subject 
to quantum uncertainty. Something like the idea that the past is determined 
only to to the extent that it is forced to be so by the state of the 
present, if that makes sense. In other words, there may be more than one 
history that could lead to the current state of the world. Let's say it 
might have been one way or another and then we make a measurement which 
resolves this question, we are 'forcing' the past to be one way or another. 
In MWI, that would be saying my 'track' through the multiverse is ambiguous 
in both directions, both into the future and 'behind me' so to speak. I'm 
unclear on this and what it precisely means. I seem to recall that it was 
critical in calculations Hawking made about the early universe - at a 
certain point these uncertainties became critical and it meant that it was 
no longer possible to say that the universe had definitely been one way or 
another. Can someone clarify this for me?

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