Why was it necessary for the president to call up the National Guard to maintain the peace and establish a presence outside some schools and universities?

during which incident? There's alot of mass shootings

hello,

i'm not so sure but i hope this in anyway.

the president of russia is head of state, and of a multi-party system with executive power exercised by the government, headed by the prime minister, who is appointed by the president with the parliament's approval.

hope this : )

d the wampanoag the pilgrims because the pilgrims protected them from their native americans foes.