Exactly this. I actually think it’s exactly the opposite of assuming your audience is a stupid: it’s respecting them enough to do the work yourself instead of offloading to them. I’ll die on the hill that 19th century referring to the 1800s is fundamentally unintuitive.

It shouldn't take 0.5 seconds of thinking, unless you're a total historical illiterate.

You're not arguing in good faith here. Which is fine, but then please stop insulting others.