Astro City, book 6: The Dark Age, part 1 : Brothers & Others Strangers
Kurt Busiek, Brent Anderson et Alex Ross2008

Nixon in the White House.
The U.S. in Vietnam.
And The Silver Agent arrested for murder ?

That's Astro City in the 1970's.

Life in a city full of superheroes, costumed criminals, sorcerers, demons, mobsters and madmen is unpredictable at the best of times. And for Charles and Royal Williams, two brothers trying to cope with a tragedy that ripped their family apart long ago, and threatens to tear them apart today, the times are anything but gooid.
(collects Astro City: The Dark Age vol. 1 #1–4, vol. 2 #1–4)