What was the first civilization in mesopotamia

The Sumerians were the first Mesopotamian civilization considered the first and oldest civilization in the world.  

The Sumerians settled in the vicinity of the Tigris and Euphrates rivers, near the mouth of the Persian Gulf. They spoke their own language and had their own religion, which was central to their social ordering.

In addition, the Sumerians left the legacy of cuneiform writing, it was considered the first record of the writing of humankind.

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explanation:

it's a secular holiday. it is and was a custom developed to recognize the ending of a time and a wish for a good future. the kind of kiss you exchange, if you are single, is intended to predict what kind of year you will have in the coming year.

it is saying good bye to the last year with all its ups and downs, and hello to the new year, with all its hopes and dreams.