What civilization built cities at harappa and mohenjo dark and built a sanitation system

Harappa was, in fact, such a rich discovery that the Indus Valley Civilization is also called the Harappan civilization. The first artifact uncovered in Harappa was a unique stone seal carved with a unicorn and an inscription.

I believe someone else has answered this question but correct me if I'm wrong, it was the Indus Valley Egypt Mespotamia China

whose power in the senate is equal to the power of the speaker of the house?

b. they tried to evict the squatters from the area.

so sorry if wrong