He is the first one uniting China under empire type of system.
Qin Shi Huang - Wikipedia, the free encyclopedia
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It is absolutely correct. There are a lot of western historians citing the Huns as the fundamental cause for the roman empire's fall.
That is due the fact that the Huns was so strong and kept beating those Germania tribes...
Those tribes could only go towards to roman empire territories ... kept beating roman empire until its fall...
the Huns had a devastating impact on the Roman world, and played a key role in the fall of the weaker, western half of it. It's not just that they compelled the Goths to enter Roman territory late in the fourth century.
The Huns were a very formidable force in their own right. During the 440s, they annihilated eastern Roman armies, plundered territory and extracted vast tribute. Yet the western Empire turned out to be the real loser. Just before Attila's horde began to ravage the eastern Empire, the eastern army was preparing to help the West recover North Africa. This operation was vital for the longterm survival of the western Empire for, without the revenues generated by the wealthy African provinces, it could not afford to build an adequate army to deal with barbarian encroachments on its territory. The eastern army was ready to recapture North Africa when it received word of the Hunnish threat to the East. So it was withdrawn, and the western Empire didn't get its essential territory and revenues.
Even though the Huns themselves were stymied in the West in 451-53--mostly through the efforts of the western barbarians and the pope, not the western Empire-- and disappeared, the failure to regain Africa proved fatal in just a few decades. Although the East tried to help again, in 468, by then the Vandals under Gaiseric were more formidable, and the venture failed, dooming the West. It is likely that, in the 440s, the Huns messed up the West's only chance to recover its possessions and survive.
Hun-Driven Barbarian Invaders of the Roman Empire
Of course, later the defeated Turks in Northern China migrated again westwards after defeated by the Tang Army... well unfortunately later caused the fall of east roman empire.
Incorrect. Roman Empire collapsed due to a host of multivariates: immigration from magna germania, continued wars with the vandals, visigoths, ostrogoths, parthian empire, internal corruption. The Huns played a role in territorial wars , but they did not lead to collapse of the Roman Empire.