no "white" european culture has ever invented writing independently either, not even the aryans; all european scripts around today derive ultimately from phonecian, hebrew or proto-minoan, and the aryans had designated gotri within the highest varna tasked with memorising the vedas through japas (and their descendants throughout india, cambodia, etc. have names like dwivedi, ek nath, etc.). every script--cyrillic, latin, runic--ultimately derives from a script invented elsewhere. in that sense, you are not much different than the black malians who wrote everything in an adapted "maghrebi" arabic script
Cambodia