Your assertion of Irish slavery is not true. Europeans came to British America both voluntarily and involuntarily as Indentured Servants, not as Chattel Slaves. There was an important legal difference. After 7 years (the usual term), the indenture expired and in most colonies, the now free person received a grant of land and farm tools. One of my own ancestors was an indentured servant in Martin’s Hundred on the James River. After the massacre of 1622, his master was dead and he wed the masters widow and was released from his indenture.
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I have Irish family members who were sold into slavery. While doing genealogy research I found numerous records of more than a dozen of my Irish ancestors who were enslaved, both as children and adults. Thus far, I have found death records, but no evidence whatsoever that any were ever freed. My most recent ancestor who came here as an indentured servant was my grandmother who arrived in 1913. She worked as a maid for 6 years, receiving only room and board as compensation. Her labor was to repay her sponsor. I actually knew her. How many descendants of African slaves can honestly say they knew a relative who was an indentured servant?