Lynda Arnez 
Pueblos indígenas de Las Grandes Llanuras (Native Peoples of the Great Plains) [PDF ebook] 

For the native peoples of the Great Plains, history is broken into two periods: before horses arrived and after. The Spanish introduced horses to these native groups around 1540, and their lives were heavily impacted. No longer did they have to hunt buffalo on foot. They could ride the speed of the herd through parts of modern-day Wisconsin, Minnesota, Missouri, Iowa, Texas, Saskatchewan, Alberta, and more! Readers learn much more about the lifestyles of the native peoples of the Great Plains, including their societal structure, relationship with early European settlers, and more. Historical images and full-color photographs illustrate the main content while fun fact boxes add even more social studies information.