The Jews were actually the 2 southern tribes that stayed loyal to the Kingdom of Israel after the split following King Solomon’s death. These two tribes were Judah and Benjamin (?). “Jews” is actually slang for “Judah” or “Judeites”.
The other 10 tribes that broke away from the kingdom were eventually called Israel until of course the Exile. After the exile, the territory of Israel (the 10 northern tribes) is later called Samaria.
So, every Jew is an Israelite, but not every Israelite is a Jew.