Describe how major changes in government structures and institutions from the classical age through medieval period signaled the beginning of the modern world

the war in the pacific

explanation:

the correct answer is =   british soldiers attacked and killed five boston townspeople.

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.