PS. I was born and live in the North...but my people did not enter this fair land till the turn of the century (19th-20th). I have no North-South Ax to grind. I am a states rights believer, but also think the attack on Fort Sumter was a strategic mistake. should have made the North make the first move. I also think that the whole slavery thing was a mistake...that should have been dealt with at the time of the writing of the constitution....but had it been a sticking point we would never have revolted against England, so it was understandable that it was not addressed at that time.
I often wonder had Lincoln lived, would he have moved the freed slaves to Guyana where he had planned to move them and solved many of the problems we live with to this day...
You can stop wondering. Lincoln had abandoned the idea of colonization long before his murder. He never envisioned it as anything but voluntary, and gave it up when it became clear there would be few volunteers.
It was never anything but a pipe-dream, anyway. The logistics and cost of such a project were well beyond the capacities of a 19th century economy.
Would be difficult today. It's equivalent would be conquering a large enough area on another continent, then transporting 45M Americans who don't want to go, and maintaining them till they could support themselves. Just not feasible.