What do nations practice protectionism

Three broad zones with different climates and resources shape russian life. they include:

The british commonwealth is: a. the national treasury. b. the british social services system. c. an alliance of former british colonies. d. a shared land for grazing sheep in britain.

What happened in the tinker v des monies? and why is it important what happened in the hazlewood v. kuhlmeier? why is it important?