The Lakota language

 Today on Facebook I saw something about a Lakota prayer. I'd seen that before, so I asked an AI assistant whether it was the British or French  who developed a writing system (alphabet, grammar, etc.) for that native American language group.  This brilliant assistant said--neither, "it was developed by missionaries,"  Duh! And what was their language? Oh well. I reworded my question several times and finally left out language and used evangelized and got Jesuits, Franciscans, Baptists, Methodists and later the Lutherans. Since Lakota was upper midwest and Canada and several language groups, I'll just have to let you do the research.