Yes, you did say their ancestors had built them, but you clearly stated that they were unaware that their ancestors had built them.

Okay. Some cultures know their ancestors built them. Some don't. Is that clear enough for you?

If you didn't mean it, you shouldn't have written it as a condition of the test.

Please....We're dealing with people here. It's hardly possible to "test" (in the truly clinical sense of the word "test") any hypothesis that involves large groups of people. All we can look at is the history of mankind and look and see if cultures have risen and fallen and left behind descendants that failed to equal what their predecessors had accomplished. I supplied ample evidence that that statement is true.

Your failure to provide a documented case that satisfies both conditions still stands.

I see so we're going to play silly little nitpicking semantic mind games. If that's the case let me rephrase the premise of my arguement. The premise is that "superior" cultures decay and are forgotten about and their ancestors either stand in awe or ignorance or both of what their predecessors accomplished. Is that really so hard to grasp?