A question about slavery that leftists will not answer nor accept the answer to

The modern far-leftism cult has this doctrine that not only did white people engage in massive amounts of slavery in the past, but they outright invented the concept and were the only people who practiced it, and if any other peoples practiced it, it was only and solely because they learned the practice from white people, and even then mostly to sell the slaves to white people.

Of course this is outright not true. (Just as one example among hundreds, the Aztecs practiced absolutely brutal exploitative and homicidal slavery long, long before they even knew that Europeans existed or had any contact with them.)

However, there's something on the opposite end of that spectrum that if these far-leftists are asked about, they will refuse to answer, they might not even know the answer (because they have never thought about it, nor taught it), and by far and large with refuse to accept the answer. Or even if some of them at some level accept it, most definitely not without huge amounts of "buts" and caveats.

And that question is: Who ended slavery? Not just in the United States, but in the entire world. What peoples outright forced the entire world to abolish and criminalize slavery?

This can be split into more particular questions: Who ended and abolished slavery in the United States? What peoples stopped the trans-Atlantic slave trade by sheer military force? What peoples forced eg. the Arabs to stop and criminalize slavery? What peoples forced the entirety of Africa to (eventually) stop and criminalize slavery?

That's right: White Europeans (or, in the case of white Americans, the descendants of white Europeans.)

White people in the United states stopped, abolished and criminalized slavery (and, more particularly, the Republican Party, against the strong opposition of the Democratic Party. Yes, look it up.)

England forcefully stopped the trans-Atlantic slave trade via sheer military force, by literally sending military ships in the early 1800's to block the slave ships from leaving Africa.

Likewise it was largely the British who forced (often via military force) the Arabs in the Middle East and North Africa, as well as eventually the rest of Africa, to stop and abolish slavery (something that took a surprisingly large amount of time due to the massive amount of opposition by those people.)

Ironically, white people did not invent slavery but they, for all intents and purposes, invented the concept of abolishing, criminalizing and stopping slavery by force.

Also rather ironically, no other peoples engaged in this (ie. abolishing and outlawing slavery), with the exception of some of them who, ironically, only did it much, much later and only because they learned the practice and the morality of it from white people.

White people might have engaged in slavery, but they were most definitely not the only ones and, on the contrary, they arguably were literally the only ones who came up with the idea of stopping and outlawing it, and forcing other peoples to do the same. Other people started doing it only much later, and only as a response to this.