Creedence Clearwater Revival/WMG

The lyrics of "Fortunate Son" pertain to multiple wars that America has been involved in, not just Vietnam.
Let's break it down: ""Some folks are born made to wave the flag" - all

Ooh, they're red, white and blue - all

"And when the band plays 'Hail to the chief'" - since the Civil War

"Ooh, they'll point the cannon at you, Lord" - all, mainly up to the Civil War

"It ain't me, it ain't me/I ain't no senator's/millionaire's/military son, son/It ain't me, it ain't me/I ain't no fortunate one, no"

"Some folks are born silver spoon in hand" - all

"Lord, don't they help themselves, oh" - all

"But when the taxman comes to the door" - all, particularly the American Revolution

"Lord, the house looks like a rummage sale, yes" - all

"Some folks inherit star spangled eyes" - all since the War of 1812

"Ooh, they send you down to war, Lord" - all

"And when you ask them, 'How much should we give?'" - all

"Ooh, they'll only answer 'More! more! more!'" - all\\"