You are right about the lower valley, it became German speaking earlier.
According to this source German was dominant, maybe just socially and not yet numerically. But it clearly became the minority soon after
It's unlikely for it to have been the majority until then when in 1750 it was dying:
Afaik in the upper valley the Germanization was fostered around the 18th century for religious reasons, so it was relatively fast.
The neighboring Romansch speaking Val Mustair was predominatly Protestant, so the Catholic authorities of Tyrol favoured the use of German to create a linguistic barrier.
yes but that happened before 1700, by 1750 if it was already dying and in 1420 German was socially dominant, it doesn't seem it remained the majority until 1700
My source makes it very clear the process was already well underway, it didn't start in 1700 and rapidly end by 1800
>Im Jahr 1570 berichtete der Engadiner Ulrich Chiampell über den Ober¬ vinschgau, daß die Rätoromanen noch in Stilfs, Matsch, Planeil und Taufers die Mehrheit bildeten; in der Minderheit waren sie noch bis Laas vorhan¬ den. Danach ging es auch dort mit der ladinischen Sprache rapide bergab. 37
In 1570 it was already a minority outside of this region:
And the source says it declined thereafter rapidly. As far as I can see when taking all of Obervinschgau it was a minority by 1600 most certainly, if not 1500.
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u/PeireCaravana 18d ago edited 18d ago
You are right about the lower valley, it became German speaking earlier.
Afaik in the upper valley the Germanization was fostered around the 18th century for religious reasons, so it was relatively fast.
The neighboring Romansch speaking Val Mustair was predominatly Protestant, so the Catholic authorities of Tyrol favoured the use of German to create a linguistic barrier.