What did voltaire mean by "envy and ignorance did not hold themselves beaten"?

The envy and ignorance that existed didn't change or go away because they are inherit to human nature. No political system can make a evolutionary change on human nature. That must happen over time.

ok sorry the answer is a. by their religion

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.