Xiongnu invaded China and Rome. Why did Rome perish and China continue?

In 445 AD, the Huns invaded Rome and destroyed it.

1 from 423 to 425, Ioanes was proclaimed emperor by the western Roman army, which caused strong dissatisfaction in the eastern Rome. Aspar, a famous eastern Roman empire, led the army to defeat the western Roman army and helped Placidius Valentinianus become the emperor of the western Roman empire, which made the political situation in the western Rome stable for 30 years.

However, in 439 AD, the Vandals established the Kingdom of Vandals and Alan. The navy of the Kingdom of Alan was strong, and it constantly attacked the Western Roman Empire from the sea. They invaded Rome in 455 AD, and the city was devastated. After the robbery, there were 7000 people left in the city. The emperor of the Western Roman Empire was killed.

In 445 AD, Attila, a Hungarian, invaded the Western Roman Empire.

Data expansion:

In 286, the Western Roman Empire was divided into two by Diocletian, and then the regime was divided into two, and the four emperors' ruling system was established. Rome began with the concept of two parts, located in the west, and was finally divided. The eastern part eventually became the Eastern Roman Empire (from17th century, it was called Byzantine Empire by western Europeans).

References:

Baidu Encyclopedia-Western Roman Empire