Well actually scripture says a great deal about it. The Assyrians took the northern kingdom (Israel) which were the majority of the Hebrew population minus the tribes of Benjamin and Judah into exile. Most of those peoples did not return.
According to scholars like Mr. Collins and archaeologists like E. Raymond Capt the Scythians, Goths and others descended from these tribes in the northern kingdom. It would seem ironic and an odd coincidence in that God's promises to Abraham which were that he would be the father of many nations. Then later Jacob prophesied over Joseph's sons Ephraim and Mannassah (sp) that Ephraim would become the father of a "company" of nations and his brother would also become a mighty nation. So where might these nations be?
Further, I find it amazing that the ancient nation of Carthage spoke a language so similar to Hebrew that the citizens of Carthage could speak directly with the Jews of Jerusalem without needing translators.
Judah was the southern kingdom and was taken into captivity by Babylon. They were also scattered yet many returned when the seventy years were over spoken of by Daniel the beloved prophet. And of course the temple was then rebuilt and remained until the prophecy of our Lord Jesus was fulfilled wherein the temple was destroyed once again by the Romans in around the year 70 A.D.
It appears to me to be supported by history that the term "Jew" was first applied to the southern kingdom of Judah who were of the tribes of Judah, Benjamin and Levi. It was these people who maintained their identity as they were dispersed throughout the world. And when they returned and formed the modern nation of Israel Harry Truman remarked in a manner alluding that they were actually descendants from the southern kingdom instead of the northern kingdom.
Anyway, this is a topic which interests me somewhat because it may help explain things which have happened among the nations of the world in recent history and may shed glimmers of light upon future events. I was hoping that someone else might have also looked at this and might be able to offer opinions as to this topic!
Here is a link to one of the radio broadcasts where Mr. Collins was interviewed by Mr. Rick Wiles of Trunews: http://endtimepilgrim.org/steven-collins.mp3
Thank you and may God bless us all!