But Ethnically and culturaly to Central asia and Iran ( not arab states) because the majority of Afghans are from the Iranic race like the Tajiks and the Pashtuns who speak iranian languages like Farsi and Pashto. And the 2nd larger race in Afghanistan are the Turks the Uzbeks and Turkmens who speak turkic languages. So it could be both central asia or Middle east.
The real border of South asia is the Indus river the east bank of the Indus river is South asia and to the west it is Central asia and Western Asia so North west pakistan who also has Pashtuns is also middle east or central asia by culture and race. Afghans don't have the same cuisine as pakistanis and Indians , bangladeshis or clothing , language branch etc. The british said in the 19th century that: Afghanistan is a country between British india and the Russian empire (central asia) it lies In the Iranian plateau Politicaly it is south asia since 2007 it joined the SAARC for economic reasons. Conclusion: Afghanistan is culturally and ethnically connected to Central asia and Middle east Politcally to South asia.
If it depends on me Afghanistan is for sure Central asia Sources: I am an Afghan/iranian historian.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.