Ah, racists…simultaneously so smug and so stupid. One racist white guy wrote in anonymously to People of Color in European Art History with a slightly leading question:
Can you explain why Europeans were much more technologically advanced than the indigenous populations of Africa? I mean, these cultures hadn’t even invented sewage systems, which is something the Romans were able to design and implement in 800-735 BC (a long fucking time before "the white man" colonized it)… I mean fuck, without "the white man", they would probably still be in the fucking bronze age.
Go read the answer. You’ll learn more about brown people’s ancient plumbing, at a time when Europeans hadn’t quite figured out sanitation, than you ever knew before. Flush toilets in the 18th century BCE, elaborate hydraulic systems in 3100 BCE, pressure inverted siphons in 1600 BCE, while Europeans’ most sophisticated approach to sewage was dumping their chamber pots in the street.