Institutional racism didn't end in 1865. The present racial disparity is the result of segregation policies starting with black codes, then Jim Crow; some that lasted well into the 1970s, others that have been created since and are in place today
If the Federal Army had stayed in the South longer, if the Reconstruction had lasted longer, if America didn't experience the century-long setback that came after the Federal Army left, what would black history look like now?
The Meridian race riot of 1871 illustrates the battles between freedmen and the KKK and other white supremacists in the South during the Reconstruction era.
Then, in 1875, federal army and the carpetbaggers leave, the KKK wins, Black Codes are put in place and the Jim Crow era begins. The Reconstruction is barely even mentioned in history textbooks.