What kind of economy did the people have along the Indus? Traditional Economy. Why do we know so little about the political structures in the Indus Valley? We can't read their writing. In what modern day countries are the Indus River Valley civilization settlements? India and Pakistan. What religion did the ancient Indians practice? Hinduism. sewage and plumbing. Why were the seasonal monsoons favorable to the development of the Indus Valley civilization? Brought rain, and flooding but also watered crops