What new state appeared after the collapse of the Roman Empire?

It is known that the main reason for the collapse of the Roman Empire was the invasion of the Huns and the activation of barbarian tribes in Europe. So at the end of the 5th century, such barbarian kingdoms arose: the Vandal kingdom, the Visigoth kingdom, the Ostrogoth kingdom, the Frankish kingdom, as well as a group of Anglo-Saxon kingdoms on the territory of the island of Britain. In addition, the Eastern Roman Empire continued to exist, however, it began to be called Byzantine.