What was the Relationship between the Vietnam War and this Deterioration of American Unity

Historians have argued that the Vietnam War had a profound effect on the decline of the “national agreement” regarding domestic and foreign policy in the 1960s and early 1970s.

What was the relationship between the war and this deterioration of American unity’s

Here is the link for the online textbook used

Citations need only be used for specific quotes from the textbook.

https://openstax.org/details/books/us-histor