Why did the kingdom of the Franks turn out to be more solid than other barbarian states

Why did the kingdom of the Franks turn out to be more solid than other barbarian states that formed on the lands of the former Western Roman Empire?

The main reason that the kingdom of the Franks did not collapse under the influence of external factors and inter-tribal wars was that all the tribes belonged to the same religion, namely Catholicism, while the tribes of the Germans and the Huns believed in different gods.
In addition, there were no disagreements between the dynasties of the rulers of the Frankish tribes, since they all belonged to the same.
During the Arab conquests, the army of the Franks put up a worthy resistance to the Muslims and was able to defend their lands, as a result of which the Arabs retreated.



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