Start with high-confidence graphic history books, then narrow by subgenre or adjacent topics.
Persepolis
Marjane Satrapi, Mattias Ripa
The Complete Persepolis
Marjane Satrapi, Anjali Singh
Between Shades of Gray
Andrew Donkin, Ruta Sepetys
Displacement
Kiku Hughes
Pearl: a Graphic Novel
Sherri L. Smith, Christine Norrie
Saints
Gene Luen Yang, Lark Pien
Boxers & Saints Boxed Set
They Called US Enemy
George Takei, Justin Eisinger
Armaveni
Nadine Takvorian
Superman Smashes the Klan
Gene Luen Yang, Gurihiru
