the civil war    http://zzwave.com/plaboard/posts/3957557.shtml

'USCivilWarFact3:Slave import banned in1807&last slave ship arrived in1860'

"Apparently slave imports still continued clandestinely after 1807 until the civil war. https://en.wikipedia.org/wiki/Clotilda_(slave_ship)"

"from a long term perspective,the blacks during the civil war made bad mistake backing Lincoln; had the slave trades, legal or illegal continued for a few more decades, USA could be a country with 20-40% blacks and significantly more demographically beneficial to the blacks. Lincoln assassination was a 'black swan' event on that particular world-line"

.........

I said should slave trade and slavery  ended a few decades after their respectively dates, the blacks could've constituted a much bigger demografic % than now