What is the size and structure of Harrapan Civilization

The Harrapan Civilization's size is about a reach stretching to 900 miles, and their built structure is mud bricks that dry in the sun and hills that can be made with those bricks and walls, and their social structure is Gods that are superior like priests and academics, Kshatryia which holds kings and warriors of kind, Vaishya who are merchants who help sell and prob trade and owners that own land, and Sudra who are the citizens living there :3

Explanation:

:3

by 1880, germany had more rail lines than great britain and russia.