This paper aims to assess whether any part of the modern-day racial gaps have their origins in the institution (and abolition) of slavery in the United States. For this reason, I break up the question into three parts: i) Did the abolition of slavery have an immediate causal impact on the race gap in prison immediately or soon after the abolition of slavery?, ii) Does the historical race gap persist today?, Can current race gaps on incarceration be traced back to the slavery? iii) Why is there persistence?. In order to do that I collect historical data from Census records, which imply that the project will have to run regressions over the entire population of the US since 1850. This accounts for approximately 1,000 millions of observations.