How have we learned about sargon of akkad why have historians had a hard time learning more about sargon and the city of akkad

nativists tried to get rid of the immigrants as they thought they were going to ruin the u.s.  

i think it is the byzantine empire

(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity