It is the first civilization, and we are ignoring it?

They 'taught' us about mesopotamia in middle school. And by that, it was just... How the civilization was near a river, and they started agriculture.

My school barely did any ancient history, was all modern history, repeated the World Wars over and over again until we could elect not to take the subject. Only ancient history we did was Rome.

Schools, in the us, can't teach history very well at all. Mostly because they don't have the time to go into detail and all the nuances required to understand a time period. As far as world history goes they have like 8 months to cram from Mesopotamia to the modern era. That's several thousand years of history. You just can't teach that stuff very well in that short of a time frame. It's rather unfortunate.