[novaomnidev]

That gdp graph doesn’t show what you seem to think it does. For one, you can’t separate the UK from Europe, since the UK being situated in Europe traded the refined goods from produced by the raw materials found in their colonies and produced by their slaves with the rest of Europe. So we should expect it’s trading partners GDP also rise along with it. Even if they didn’t directly participate in the slave trade at the time (Germany). OPs comment is not “self evidently incorrect” in the least bit.