I don't know where I heard this originally (somewhere in grade school I think) but I have a very vivid memory of hearing this story:
Apparently at the beginning of the Civil War, Lincoln sent a letter to Davis imploring him to rejoin the Union without pursuing war in order to spare the lives of American soldiers etc etc, and if Davis did so within 100 days, Lincoln would abandon (or postpone?) the idea of abolishing slavery. Something along those lines - like if Davis rejoined the Union without war within 100 days, the South could keep their slaves.
I looked for this letter online and couldn't find anything, so I was wondering if any history buffs could clarify if there is any truth to this, or if I made this up somehow? Thanks!