What measures did Sargon take to unite his empire?

He took the walls down from other city-states and demanded loyalty from their governor or he would replace them with his own men. He also stated that his sons would rule after his death.

Explanation:

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.