Han China was very large and diverse.
This usually means that the Han could not be stabilized
The opposite was true
Han China had perfect boundaries
These boundaries protected Han China from invaders
First off, the Great Wall surrounded the whole country.
Second the Himalayas protected the country from the south west
The Pacific ocean protected it from the East
The Tien Shan protected it from the north west
While China was protected very well, it also had trade options
The silk road helped China in trade
This road ran from China all the way to the Mediterranean Sea
The main product traded on the silk road was silk
These trade options helped aid the Han's economy
The whole state was controlled by the emperor
The Han was successful, because the emperor's of the Han tended to give more back to the people than take from them