I'm going to guess 0.
Seth,I've been trying to respond to you for almost an hour now. But at the risk of seeming an ingrate, this+%#%# technology ain't there yet. I can't correct any typos without losing everything I've written. You're basically right - as far as I know. Only Lincoln went beyond mere necessity after the Emancipation Proc. (which actually freed few slaves). He passed the 13th amenment which made "blacks" eligible to become citizens. He didn't have to do that.
none was my answer because that big difference is the norm not a crisis.