Nomads is the right answer.
Anyone who moves from one place to another rather residing in one place is called the nomads. There can be many reasons for the migration of the nomads such as herders change places because of the weather( that is not suitable for their animals). whereas, other nomads including that of the traders and merchants, travels move for exchanging of their goods.
The Inflation Theory is the most recent theory that upholds the big bang theory, but suggests a sudden expansion after the bang.
The first civilization was established in the Indus Valley around 5000 years ago
I would create a peaceful world where everyone got along and I would also end world hunger.
