why was wudi one of china’s most significant rulers?

Ahe expanded the empire and set up the civil service system that was used in china for many years after his rule.
Bhe maintained economic stability but he mistreated the people whom grew dislike of him.
Che was only supported peasants so he made reforms that solely benefited them.
Dhe was a fair ruler but he did not trade often with foreign governments which caused a collapse in china’s economy.