Why are a variety of different sources, both primary and secondary, essential in our understanding of an event or historical time period

Primary sources allow students the opportunity to analyze and interpret what they read, see, or hear. In contrast, a secondary source is something that was not created first-hand by someone who participated in the historical era.

Explanation: Hope this helps :)

citizens get the vast majority of their political and governmental information from the media, which includes television, print journalism, radio, and now the internet. the media play an important role in connecting people to government.

"this speech"? what speech are you talking about?