PositiveLos Angeles Review of BooksMegan Kate Nelson\'s great gift as a historian and as a writer is finding the connected threads of the sprawling story of the place we call the United States ... In her latest, Saving Yellowstone: Exploration and Preservation in Reconstruction America, released in the year of the park’s sesquicentennial, she narrows the aperture, examining the 1871 expedition that mapped the region and prepared the designation of the country’s first national park.