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I'm working on an African TL with a POD of 213-212 BC during the Battle of Capua with the 2nd Punic War. From this, a bunch of sub-Saharan civilizations will spring up and spread through the continent. I want to know what you guys think the best or most likely writing systems to spread through Africa. There's Demotic (abjad, for comparison, Arabic is an abjad script), Merotic (alphabet), Coptic (alphabet), Ge'ez (abugida), and Punic (abjad).

Almost all of Sub-Saharan Africa is populated with Niger-Congo speakers and most Niger-Congo languages are tonal. I was thinking the Sahel civilizations would probably be adopt the Punic script but would the alphabet make more sense for tonal languages? And I figure Eastern/Southern Africa would adopt the Ge'ez script based off of Axumite influence. But again, is an abugida the best fit for tonal languges?

What do you guys think?
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