I want to know the answer to the following question:
What period was the first known city states established in Myanmar?
All the background I'm provided with is that "The city-states were founded as part of the southward migration by the Tibeto-Burman-speaking Pyu city-states, the earliest inhabitants of Myanmar of whom records are extant, from present-day Yunnan.". Is that enough to answer the question?
Answer: no