Answer:
The Warring States period in China lasted from 453 BC to 221 BC. In Europe, this period coincided with the height of Hellenistic power in the Eastern Mediterranean, and the development of the Roman Republic in the Western Mediterranean.
In Central and Western Europe, different Celtic tribes dominated, but most of them would be eventually conquered by the Romans in the following decades.
In Northern and Eastern Europe, many semi-nomadic peoples, that were in the bronze age of development, roamed around without forming any strong kingdoms.
