What period does the era of the first centers of civilization and the first states cover?

It covers the Bronze Period (3500 BC – 1200 BC). At this time, the first civilizations appeared in the Ancient East, in India and on the territory of China. The most ancient of these was the Sumerian civilization, which reached a high level of development. The very first developed state was the Egyptian kingdom, which arose at the end of the 4th millennium BC. On the territory of the Ancient East, the state arose in the second half of the 3rd millennium BC and it was called the Sumerian-Akkadian kingdom.