Which statement best describes how river valleys impacted the development of ancient civilization

federal power is further limited with a system of checks and balances that gives each branch of government a measure of power over the others.

explanation:

i told you before its c

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.