We can't invoke ellipsis if we're supposed to be providing TWO reasons. Without "and because" it looks like one big reason. Adding that second marker separates out the two different parts as distinct reasons. Of course, if actually try to read the thing as one big reason, it doesn't make sense (how does grape type cause emigration?), but that's just one more reason to add the marker. It adds structure and thereby makes the intended relationship of the different elements clearer.
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