After the fall of the roman empire the merovingian dynasty of the franks did what

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.

according to worldatlas.com, the u.s. has an 86% literacy rate.