If I could save the Union without freeing any slave I would do it, and if I could save it by freeing all the slaves I would do it; and if I could save it by freeing some and leaving others alone I would also do that. What I do about slavery, and the colored race, I do because I believe it helps to save the Union...
Lincoln freed the slaves because it was expedient to do so. But it was a great act and certainly the right thing to do.
You were taught to be cognizant of racism because our country was a racial caste system for hundreds of years. Moreover, Jim Crow was less than a lifetime ago, racial redlining was legal as recently as the 1970's, and the crack-cocaine sentencing disparity existed as recently as 2010. Race is at the center of America because America put it at its center, time and time again.