The Treaty of Versailles caused long-term instability in Europe (and parts of Asia) by ignoring the nations who had lost WWI. The treaty didn't provide any support for the nations who had lost, creating resentment in the hearts' of their people. This disunity allowed for the rise of facist dictators post-WWI, eventually causing World War II.
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Significant conversions also occurred beyond the extents of the empire such as that of the Turkic tribes in Central Asia and peoples living in regions south of the Sahara in Africathrough contact with Muslim traders active in the area and Sufi orders.
These are the circumstances under which the protest of the students in Tinker v. Des Moines would be deemed unprotected speech:
if their action had clearly threatened order and safety.
And since it didn't, there was no reason for it to be deemed unprotected speech.