Ole and Lena are central characters in jokes by which specific portion of  Americans, in the broad sense?
Ole and Lena: Ole and Lena (also Sven and Ole) are central characters in jokes by Scandinavian Americans, particularly in the Upper Midwest region of the U.S., particularly in Minnesota, Wisconsin, Iowa, South Dakota and North Dakota where Scandinavian immigrant traditions are common. Scandinavian Americans: Scandinavian Americans or Nordic Americans are Americans of Scandinavian (in the broad sense), or part-Scandinavian ancestry, defined in this article to include Danish Americans (estimate: 1,453,897), Faroese Americans (no estimates), Finnish Americans (estimate: 677,272), Greenlandic Americans (estimate: 352), Icelandic Americans (estimate: 51,234), Norwegian Americans (estimate: 4,602,337), Sami Americans (estimate: 30,000), Swedish Americans (estimate: 4,293,208).
Scandinavian Americans