If I remember all the sources from the past, the phrase 'rest is history' always talks about the positive results. Is there any way that this phrase is used for the negative results or in that sense, does this phrase has any negativity?
It's strange but true. Even I think of all the instances I read and remember that most of the times, if not every time, 'rest is history' talks about the positive things.
But then, actually it is meant to say that 'something is known there after'. Cambridge dictionary has an entry for this.
the rest is history: everything that happened since then is well known.
Hey, check that...there too it is positive! A good question (+1)