No, you have not. Because did not abandon them in 1868. He did not take office until the following year. It was the administration of Hayes' eight years later that did that.
You drew pictures of flowers that were not pretty in class, yes.
You don't know when the 15th was passed, do you dumbass? prior to that, the Feds began defunding the Freedman's Bureau, and generally abandoning the southern states. Being stupid, you probably just suck up the usual propaganda from the Lincoln Myth and other fake news.
Those in the PEanut Gallery with a serious interest in the history can find copies of
Ordeal By Fire ...
xxvi, 671 pages : 23 cm
archive.org
... and even better history,
Reconstruction: America's Unfinished Revolution: 1863-1877:
earlyhistorybloggerus.blogspot.com
Don't rely on commie distortions and idiot parrots like 'Jackson' here. And yes, ladies and germs, 'Reconstruction' began in 1863, not after the war, and it began with 'contraband camps' where hundreds of thousands of 'free blacks' were forced to endure starvation and disease as bad or worse as any Civil War prison camp as the North exported record crops to Europe and made sure not many blacks set foot in northern states.
Those who were forced to work on the govt. plantations fared a little better, but not much. Lincoln declared them 'free' and paid them wages, about $2-$4 a month, in greenbacks, which amounted to about half of what the average southern plantation owner spent in subsistence for slaves, the latter about $60 a year, which also included medical care on top of subsistence.. They could not leave their 'free' plantations without written permissions from their new Yankee owners... err ....'employers ... or get thrown back into the prison camps pretending to be 'refugee aid stations'.
More stuff as well, re the carpetbaggers sent down to plunder the South began whining they couldn't make a profit off those lazy Negroes n stuff, and the abandoning of any pretense of black equality. Indeed the whole premise was abandoned long before the 15th, and afterwards Grant refused to enforce it.