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Laos, Cambodia, Thailand, and Myanmar all use their own phonetic scripts but the only writing Vietnam had before the French came was a modified form of Chinese characters, and literacy campaigns after the revolution would be more difficult if you had to memorize a character for every word instead of just a letter for each sound. If Vietnam wanted to create its own non-Latin script without using Chinese characters, it would have to adopt another language’s writing system or create a completely new system. The Zhuang language in southern China historically used Chinese characters but it wasn’t a good fit and they’ve been using Latin now since the revolution.
Yes, but the Korean script was created in the 1400s and they had no phonetic script before that while Vietnam already has a phonetic script.