The Han Dynasty lasted over 400 years. The Han's also helped in completing the Great Wall of China.
The Han Dynasty started when Lio Bang gained control of the Han kingdom conquered the Qin army and established the Han Dynasty.
One of the major events that happened during the Han Dynasty was the invention of paper which advanced the art of calligraphy. Another major event is when the healers learned about the human body and developed techniques that are still used today.
The Han Dynasty ended do to a political unrest, invaders, a political smuggle, a rich and poor gap, social problems and finally food shortages.