In my own word secondary source is?

Secondary sources were created by someone who did not experience first-hand or participate in the events or conditions you're researching.

Explanation:

Hope tht helped

the quote by walter cronkite contributes to the central idea of the text by supporting the central idea. cronkite argues that what is deemed “right” for and in america may not be good for other countries. this supports the central idea of the text, that the vietnam war was unpopular in america for multiple reasons- including cronkite’s.