Jefferson, the evil slave owner white supremacist, actually denouncing the English King for bringing slavery to our world in his original version of our Declaration of Independence.
I'd wager 99% of the citizens of our country do not know that fact.
I believe that no single man in history better deserves credit for ending slavery than Thomas Jefferson. The five words he put into the Declaration of Independence had a massive impact on the subsequent abolition movements. They singlehandedly caused slavery to be abolished in Massachusetts, and they made people aware of the dichotomy between slavery and freedom.
I think without Thomas Jefferson, the anti-slavery movement would have taken many decades longer.
His words have such an effect that for many people they are the only part of the Declaration of Independence which they can quote, or view with any significance.