From Thinq:
According to the new data published by the FBI, those figures have seen an even sharper drop in the last two years which can be attributed to a number of factors according to the BBC. Top of the list is the so-called 'Obama Effect' which posits that African American youngsters have been so inspired by the USA's first black leader that they're turning away from the crimes with which they were disproportionately involved and getting educated instead.
Read more here.