Sure, but it's still a world fair. Those buildings are temporary and made of plaster. It's not like we're discovering some grand civilization that has been usurped. It's just that fairs used to go way harder back in day.
Really what TuEstUnePommeDeTerre did was help us with ours. "Do your homework" is the laziest phrase, I cannot express how much I hate it. Its a phrase of dismissal. If you have a kid that is struggling, you should HELP them with their homework, not just tell them to do it. I say this because I think it is emblematic of the intellectual laziness of the folks who use this phrase thinking of it as punctuation in their winning argument.
Thanks for teaching us something new! I've never heard of the Trans-Mississippi Exposition. Funny, with a name like that, if it was held now it would be wildly different.
Edit: I misunderstood your question and tone, sorry, but everything below still stands!
They're temporary buildings made of wood, plaster of Paris, and cement, built here as an 1898 World's Fair.
"You are being lied to" heavily implies that the history of Omaha is being glossed over somehow (perhaps with respect to the Civil War? though it was a Union state, and the photo decades later than the war), and that this was the architectural style and decadence of Omaha. You are being lied to, every day, by politicians and advertisers and corporations - but the photo has no relevance to this. These buildings are little more than façades.
Somewhere, in middle America, a tyrant had been allowed to grow and fester. "He still lives in the same house," they say, as if morality could be measured by possessions. This new type of villain requires a new type of hero. No super powers. No leaders. Just a commitment to ending billionaires, a list of names, and some affordable Molotovs.