What contributed to the downfall of the roman empire but not the Han dynasty?

The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman Empire.

The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman empire.

The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman empire.

The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman empire.

The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman empire.

The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman empire.

The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman empire.

The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman empire.

The Han dynasty was a Chinese dynasty and had nothing to do with ruling the Roman empire.