The apologies are for the time before the Dems took over, when the racist Republicans were in control.
Those wacky Democrats are awfully slow. Took only about 70 years for them to get around to it. I can hardly wait for the apologies to the Japanese-Americans "sequestered" during WWII. California.... And then they can apologize for taking land from the Mexicans. In another 70 years or so. :)