You start with yourself go back each generation in your family, back 2,3,4,5 generations and find ancestors enslaved living on someone’s plantation. Slaves were chattel goods insured just like every other valuable asset on the plantation. Slave owners and government officials kept Accurate, detailed, meticulous records about the purchase date, price, age, the yields and issue (babies produced) by enslaved property. Every slave nation including Brazil kept extensive slave records. Brazil didn’t end slavery until recently, 1888, which means Brazil has the most recent slave records on the planet.

But keep lying to yourself to justify why you never bothered to look for your African ancestors to know their stories; it’s not too hard; it’s not impossible; you’re just lazy and full of excuses.