Apart from the fact that you’re pretending 150 years (with the civil rights legacy still not resolved) is much the same as a whole millennium, you’re also ignoring the substantial differences between the slavery your ancestors endured and the chattel slavery practiced as a result of the transatlantic slave trade.
Chattel slavery meant a lifetime of slavery and children born into slavery, often through rape-for-profit by slaveholders. Enslaved families being ripped apart on a whim if a sale was convenient for their enslaver.
The transatlantic element meant enslaved people were permanently recognisable as slaves.
And the creation of the particular form of racism found in the Americas to prevent poor whites from fraternising with their most natural allies.
An investment in African slaves also ensured a cost-effective, long-term workforce. Female slaves were often raped by their white owners or forced to breed with male slaves, and children born into slavery remained slaves for life. In contrast, white female servants who became pregnant were often punished with extended contracts, because a pregnancy meant months of lost work time. From a business perspective, a white baby was a liability, but African children were permanent assets.
As the number of African slaves grew, landowners realized they had a problem on their hands. Slave owners saw white servants living, working, socializing, and even having babies with African slaves. Sometimes they tried to escape together. What’s more, freed white servants who received land as part of their freedom dues had begun to complain about its poor quality. This created a potentially explosive situation for landowners, as oppressed workers quickly outnumbered the upper classes. What was to prevent freed whites, indentured servants, and African slaves from joining forces against the tyranny of their masters?