This early civilization was able to build one of the most advanced trade networks of its time because it had the technology to do so. advantages included flat-bottomed boats, carts, and sailing skills. babylonian egyptian mesopotamia indus valley

The correct answer is Indus Valley. 
The community of the Indus River Valley Civilization earned many eminent advances in technology, including great accuracy in their systems and tools for measuring length and mass, boats and watercraft, carts, and other wheeled transport.  

  i think colonial period |-/