Since this is being asked on Hexbear and not r/manga, I'd recommend "Sensou wa Onna no Kao wo Shiteinai," the manga adaptation of Alexievich's "The Unwomanly Face of War." That book is a collection of interviews with female soldiers of the Red Army that fought in the Eastern Front of WWII. As with all things USSR that see the light of day in the English speaking world, the author is an anti-communist, which is why she won the Nobel Prize for Literature for this book. However, the work is still worth reading because the interviewees are all Soviet war heroes and their deeply personal stories are the focus. Alexievich's "capital T Truth" fetishist shtick means that she doesn't often editorialize or interject, for example, every time Stalin is mentioned with "By the way, dear reader, remember that he ate all the grain" like Western accounts of socialist history do (though there are a billion footnotes crammed in the book version that "clarify" the interviewees' narratives with the anticommunist correct-think "fact checks"). The illustrations really bring to life the stories of the interviewees in a vivid way and so it's worth checking out.

Some great historical fiction include "A Bride's Story," set in 19th century Central and West Asia, with a great cultural anthropology-lite style narrative, and "Song of the Long March," which is set in Tang China and has a great portrayal of the deeply interwoven relationships between Han Chinese and Uyghurs in that historical period. I actually came across that work before all the Western atrocity propaganda started clogging the airwaves in the late 2010s and I'm personal grateful to it for pre-emptively being my first impression to the Uyghur Chinese people rather than having some shoddy copycat Holodomor 2.0 plagiarized slop become the introduction to that culture.

As a purely personal aside favorite, I'd also recommend "Fire Punch." It has a lot of the typical anime genre nonsense and really, the only reason I'd recommend it is that it has one of the best portrayals of an LGBT character in manga and anime. I was deeply struck by it personally and I've also seen heteronormative responses to the manga remark that the character humanized "LGBT individuals" as something beyond a "concept" for them.