To begin with, there are very few facts about unknown civilizations of the past, which do not really fit into the familiar history, at least because of their capabilities and knowledge.
I can write several articles about the knowledge and capabilities of ancient civilizations, since everything can be listed for a long time, but the main ones are construction, processing, moving, lifting and some other facts that are not particularly explained by the official history.
And whatever the skeptics say about the allegedly evidence of the existence of highly developed technologies and, accordingly, civilizations is not enough to introduce them into history, this is not the case.
In fact, the facts are simply incredible, and even taking into account the fact that they are partially being ignored or hidden, these facts and findings are all the same, almost everywhere.
In general, suppose that the existence of highly developed civilizations is accepted as a fact and is not even disputed, what will happen? It seems to me that the worldview of many will change and it is quite possible that various religions, in principle, will cease to exist.
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Since it would be strange to believe in gods, when practically real gods could exist in the past, relative to our civilization and the level of development.
It is difficult to say whether this is good or bad if there are no religions, but in the case of an official statement, it seems to me that something similar would have happened.
But the most important thing is people's opinion about our civilization. Most likely, the ancient people really existed and they were not particularly different in their knowledge, facts also speak about this, but every civilization cannot say that we are nothing compared to the previous ones.
If they said now that humanity is not comparable to the highly developed civilizations of the past and we are not capable of much, at least this would undermine the desire to work and, in principle, to develop, although this is again my subjective vision.
Another possible fact is the danger of ancient knowledge. This is personally doubtful for me, but in theory, knowledge and technology of previous civilizations, if available to someone, they can be dangerous for most people.
And despite all these facts, everyone should understand and it is quite obvious that the state, politics and a vision of the past play a big role everywhere.
In general, for example, if something is found in China that contradicts history, it is unlikely that the whole world will know about it, and this is already a proven fact, as in the example of the Chinese pyramids.
So it is with America, Europe, Africa and any state. It is unlikely that someone will share discoveries and findings with the whole world, although this could open up a lot of new things.
And by the way, this is not to mention that some states have different histories, for example, the 19th-20th centuries, although skeptics will still declare that nothing is being rewritten.
It seems to me that if human civilization, in principle, would not be what it is, when practically every state wants maximum power and territory, history would be all right.
And yes, as I have already written many times, if people ever thought of uniting with the whole world, knowledge, scientists, technologies, etc., perhaps people would already be not only on Earth, but such an outcome is practically unrealistic.
As a result, everything is cyclical and wars will continue, humanity will lean back in development and start all over again, and history will be rewritten, as it happens even now.
And most likely, each subsequent civilization will consider itself the most "great and developed" that we supposedly are. This is where we can end and repeat that these are my subjective thoughts, although it seems to me that they are quite logical and obvious.