[zzzpaz]

You draw the line the same way history draws it. https://en.m.wikipedia.org/wiki/List_of_time_periods

We're in the contemporary era and things that happened in the Nazi time are still relevant. While things that happened in the ancient era are, by definition, ancient.

So if you want speak about history a good start is to try to study it first.

Otherwise next time we're discussing on how aggressive were people in the Neolithic and how stupid were the law in the Code of Hammurabi