Which historical theme does the timeline most reflect? O A. Cultural development and exchange
B. Interactions between humans and the environment
O C. The expansion and interaction of political systems
D. The transformation of social structures

treaties

explanation:

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.

use wikipedia, i think they have this.