Why millions of Jews eventually moved to, and settled in Europe.

Because of the rise of the Roman Empire

Explanation:

Some Jews, a Judaean Israelite tribe from the Levant, migrated to Europe just before the rise of the Roman Empire. A notable early event in the history of the Jews in the Roman Empire was Pompey's conquest of the East beginning in 63 BCE, although Alexandrian Jews had migrated to Rome before this event.

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1. darius the great     persia  

2. piankhi       nubia

3. ezana       aksum

4.     nebuchadnezzar     babylonia

5. shalmaneser iii     assyria