Something interesting to think about is that the potato has become an essential and staple food in some places like the central mountain highlands of Afghanista

Something interesting to think about is that the potato has become an essential and staple food in some places like the central mountain highlands of Afghanistan, but it didn't exist there prior to sailing ship contact between the "new world" and "old world". How exactly the potato made it there from Spanish, Portugeuse and early English expeditions around 1500, and the lag time until it became commonplace there I am not quite clear.