Trade increased in eroupe because of the interest in eastern goods created by:

(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

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.