The official narrative is that over 200 huge buildings were built for the Chicago Worlds Fair only to be torn down a few years later. Everyone believes that story, even though they wouldn't have been able to even complete the foundations of the buildings in time for the fair with 1893 machinery.
(www.youtube.com)
Ancient Civilizations
No worries... all im saying is you can build a house in 5 months lol... so you can probably build a shitty facade for a world fair in less than a year with enough Mexicans and a highly reproducible plan ;)
Its an interesting theory... However, we have photographs of Native Americans and their environment dating as early as the 1850s, as well as plenty of early photographic documentation of various American engineering feats of the late 1800s. The Chicago world's fair wasn't until 1890s. I think it highly unlikely that our ancestors spent the time and money staging expensive and unwieldy equipment needed for photos for 40 years prior to the world's fair to hide a takeover of cities that they didn't build.
However, the American government did royally screw over the Native Americans, so I could see where it would be easy to believe anything negative perpetrated by the government is possible.