The Han dynasty retained much of the centralized administrative structure of the Qin dynasty but established some vassal principalities in certain areas for political convenience. Technology advanced during the Han dynasty to include paper, the compass, and the seismograph. The Han dynasty also expanded trade with foreign countries.

1. Han dynasty
• The empire retained much of the
Qin adminstrative structure but
retreated a bit form centralized rule
by establishing vassal principalities
in some areas for the sake of
political convenience
• The technology soon inhanced to
paper, compass, and the
seismograph.
• They expanded trade through
other foreign countries