The book "When the Tree Bloomed: An Authentic Tale of the Ancient World of the Sioux" by the author John Neigardt is a historically significant narrative about one of the most poetic periods in the life of North American indigenous peoples - the period of flowering of the Sioux. An authentic tale, filled with the spirit of ancient times, tells about the unique culture, customs and beliefs of the Sioux Indians and shows how they lived and communicated, preserving the traditions of their people. In addition, the book allows the reader to feel a part of this amazing world, revealing its beauty and wisdom. "When the Tree Bloomed" is a fascinating and very important read that will help anyone to delve into the world and culture of the Sioux Indians.