The illustrations are beautiful & of course I love a book about my home state as much as the next person. That said, this book is lying about what is.
As far as I've been able to find, there is no actual legend of how Michigan got its shape, so this story is a fabrication. Which ok, that's fine, it's a picture book, but a white person making up a story using bits & pieces of Pottawatomie lore for color is so not cool. Relations with & education about indigenous peoples is rough enough, you don't need to start making things up, slapping the word legend on there like it's a real thing.
One, it's not very nice, and two, you're confusing children.