Difficulties faced by people as they expanded their countries prior to the advent of modern technology.

that was the question or where the example

Explanation:

(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

do u have any answer choices?