Let’s hear it for the Olmecs of southern Mexico–another civilization with great achievements to its credit, but nevertheless consigned to oblivion.
Point this, this has happened to any number of civilizations; and it could happen to ours. We don’t know what the Olmecs did to make their civilization disappear–but we can see with our own eyes what we’re doing to make ours disappear.
https://leeduigon.com/2014/10/25/nameless-portraits-on-a-colossal-scale/