ALEXANDRIA — Was Alexandria really the "birthplace of America"? That's what Big Ole's shield reads, and that was the topic of a presentation at the Kensington Runestone Museum last week. "If you believe that the Kensington Runestone is … authentic, (that) it was left by Norsemen, then you would believe that this is the birthplace of America because this is where they came to first," said Barbara Haacke, executive director of the museum. Of cours…