Bernt Olmanson writes about recently freed African Americans being sent north as laborers by Union soldiers.
I dont believe it will pay for you to use all our land. In case you cannot rent out some, then it is best that you leave a large part of the poorest fields idle. I could send you a black man, but the transportation is too high. Here there are enough of them whom one can get for next t nothing. If you cannot rent out any land at the usual rate, then let what you cannot use lie idle.
Source: Bernt Olmanson, Letters of Bernt Olmanson: A Union Soldier in the Civil War 1861-1865, trans. Keith Olmanson (Minneapolis, MN, 2008), 41.