They both did a lot of damage for example they affected the economy & a lot of people died.
For Dictatorship, the second answer is incomplete, a dictator may obtain power not only through elections but by a military or institutional coup d'état, a civil war or a military intervention by a foreign power.
In a republic, power is held by those citizens that are able and government is a public matter (res publica in latin) to vote and the power comes from their vote during elections.
Answer:
Achievements of the Harappan civilization included all of the following except Indoor plumbing
