Answer:
They build up a methods for acquiring new products through the area; Trade courses brought a social trade that brought about noteworthy headway in human progress all through the locale.
Explanation:
The early River Valley Civilizations rose on the Yellow River (China), the Indus River (India), the Nile River (Egypt), and between the Tigris and Euphrates Rivers (Mesopotamia). The need to flood edits with the end goal to support a lasting, huge populace made stream valleys especially suited for the improvement of human advancement. More extravagant soil because of surges additionally made it conceivable to have consistent nourishment surpluses. This enabled the networks to take part in non-agrarian exercises, for example, craftsmanship, organization, design, exchange, and so forth.