Why do Yoopers say eh?

Why do Yoopers say eh? From Big7Travel.com: ‘Yoopernese’ is the dialect you’ll hear in the Upper Peninsula of Michigan. The accent is heavily influenced by the area’s Scandinavian immigrants, so they say ‘yah’ instead of yeah, “d” for “th” (“dere” for there, “dat” for “that”) and ‘eh’ at the end of most sentences.

From Big7Travel.com: ‘Yoopernese’ is the dialect you’ll hear in the Upper Peninsula of Michigan. The accent is heavily influenced by the area’s Scandinavian immigrants, so they say ‘yah’ instead of yeah, “d” for “th” (“dere” for there, “dat” for “that”) and ‘eh’ at the end of most sentences.
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