What happened 600 AD

The period from c. 600 BCE to c. 300 BCE witnessed the rise of the Mahajanapadas, sixteen powerful and vast kingdoms, and oligarchic republics.

The Sangam period is the period of the history of ancient Tamil Nadu, Kerala, and parts of Sri Lanka (then known as Tamilakam) spanning from c. 6th century BCE to c. 3rd century CE.

The estimates for the populations of the largest cities (Veii, Volsinii, Caere, Vulci, Tarquinia, Populonia) range between 25,000 and 40,000 each in the 6th century BC.

In addition to his military exploits, Nebuchadnezzar was also a great builder, famous for his monuments and building works throughout Mesopotamia (such as Babylon's Ishtar Gate and the city's Processional Street). In total, he is known to have completely renovated at least thirteen cities but he spent most of his time and resources on the capital, Babylon. By 600 BC, Babylon was seen by the Babylonians and possibly by their subject peoples as being the literal and figurative center of the world. Nebuchadnezzar widened the city's Processional Street and fitted it with new decorations, making the annual New Year's Festival, celebrated in honor of the city's patron deity Marduk, more spectacular than ever before.

Late Middle Preclassic from 600 to 50 BC.