Try it with a four function calculator and a calendar to see how much one set of personal consumer preferences really matter to “history.”

There was more than one “Vietnam War” in Western pop culture. If one served in The Republic of Vietnam it's 1955-1975. “In all other cases...” that would be August, 1964 through May, 1975.

On the 'other' side of the so-called Cold War, protest songs were (are) a capital crime. So no surprise, a dearth of North Vietnamese, Soviet, Mainland Chinese, Cuban &c A&R. Not that it matters.

For the other side, one of the most jarring aspects of coming back to “The World” was how completely it chose to ignore the whole affair altogether. To wit:

1964-1975, Billboard Hot 100 Year End, top 3-
1964: I Want to Hold Your Hand; She Loves You; Hello; Dolly!
1965: Wooly Bully; I Can't Help Myself (Sugar Pie Honey Bunch; (I Can't Get No) Satisfaction
1966: California Dreamin; 96 Tears; What Becomes of the Brokenhearted;
1967: To Sir With Love; The Letter; Ode to Billie Joe
1968: Hey Jude; Love is Blue; Honey
1969: Sugar, Sugar; Aquarius/Let the Sunshine; I Can't Get Next to You
1970: Bridge Over Troubled Water; (They Long to Be) Close to You; American Woman
1971: Joy to the World; Maggie May/Reason to Believe; It's Too Late/I Feel the Earth Move
1972: The First Time Ever I Saw Your Face; Alone Again (Naturally); American Pie
1973: Tie a Yellow Ribbon Round the Ole Oak Tree; Bad, Bad Leroy Brown; Killing Me Softly with His Song
1974: The Way We Were; Seasons in the Sun; Love's Theme
1975: Love Will Keep Us Together; Rhinestone Cowboy; Philadelphia Freedom

Note:
1966: The Ballad of the Green Berets @#10
1970: War@#4

As you were. Carry on.