The UK abolished slavery by an act of parliament. A parliamentary monarchy is a historical quirk that does not need the monarchy to function.

Good that you agree slavery was abolished by a country with a monarch ... you skipped over the second point; the country most associated with industrial scale slavery in the world had no monarch.

It's a loose correlation you're making here, very much a "let's build this skyscraper with wet noodles instead of steel" approach.

Slavery was “abolished” in the UK while that same nation continued to traffic and profit from enslavement for quite a long time it’s “abolition”. Is your point that monarchy is good, or that slavery is associated with all forms of government?