I'm reading/writing about the Song dynasty (960-1279), which is when the Chinese population really started growing in the south. Apparently this was due in part to the introduction, around 1000 AD, of new rice varieties from SE Asia such as the Champa rice, that were easier to grow in the warm climate of Southern China. I see from the map above that two Rice resources spawn in the south in 200 BC; I wonder if it'd be appropriate to move one or both of them to c. 900-1000 AD instead? Or add another rice resource at that time, or just generally spread the South China resource spawns over a longer time period.
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