The name that given is Muckrakers
The term was popularly coined during the development of early progressive era in the period of 1890s - 1920s.
Back then, the government and the establishments were known to be really corrupt and many Muckrakers started to do investigative journalism to find out the truth about their practice.
Answer: D) The use of the domesticated horse in hunting and warfare.
Explanation:
With horses now domesticated, the Indians could travel so much further than before which led to them being able to hunt animals more effectively in many parts of the land.
The Indians also used the horses in warfare as some of them got so adept at using horses that they developed astonishing qualities which they then used to expand their territories against weaker tribes.
Elections
The fact that leaders get to contest in an election to win the mandate of the people so that they can lead ensures that they are responsive to their wishes. This is because voters will naturally elect people that are sympathetic to their issues
