You initially claimed that it was purely technological superiority that allowed Europeans to conquer America. This is not an understanding reflected in the literature. If it were the case, then why was it only much after the colonization of America, which began in the 16th century, that Asia and Africa were able to be colonized, in the middle of the 19th century? The difference between the technologies in the 16th century was not a huge jump, though its obviously true there was a discrepancy. Native Americans acquired horses after contact and incorporated them into their culture and by the 1700s some of the tribes in the great plains had fully transformed into a nomadic horse based life-style. Firearms are a similar story. One can imagine the difficulty 16th century europeans would have faced if they were to colonize an entire continent, without it being conveniently depopulated beforehand by plague.
You appear to recount that my claim was that American (US) slavery was a unique factor in the exceptional rise of Europe in the early modern period. This was a claim made by no-one. You'll recall that slavery in america refers to an entire continent - as I repeatedly pointed out - not an isolated group of states. My claim is that the depopulation and subsequent colonization of the entirety of the continent was a significant factor, along with the shift in political and economic structure that accompanied it.
Up to the 16th century you will find a wealth of european accounts of contacts with kingdoms in the Congo to East Asia, whereby they are described as equals in sophistication and size - most famously with Marco Polo's accounts though there exist many others. The change in perception of relative technological prowess in historical accounts occur much later, but certainly by the 1700s with the advent of the industrial revolution in the early modern period. This is well documented.
Why did the industrial revolution occur? It is a very large and open topic, though I lean towards the explanation that it was due in part to both the change in social structure during the reformation, as well as the colonization of america (the continent) and the development of economic networks with the extraction of resources (mercantilism, chartered trading companies etc.). This system was aided by and intensified by the trans-atlantic slave trade.
I'm sorry about the lack of "falsifiable content", or the lack of brevity. Unfortunately we are discussing history through the most sweeping lens possible, not science.
>unloading all of of our own biases
Again, what are you vaguely trying to allude to. Just say it.