When would the government be allowed to limit what people say?

Explain the significance of martin luther king jr's letter from a birmingham jail and i have a dream speech

What is significant about official languages in russian republics? why would it matter?

How were the okanogan highlands formed? a. by subduction, which caused huge folds in earths surface b. as a result of retreating glaciers carving great valleys into the earth c. when molten rock from under the earth approached the surface d. when the collision of volcanic island chains and ocean rocks formed new earth