Denver Public Library, Western History Collection, TMD-469 (top left); Alamy © Amar and Isabelle Guillen—Guillen Photo LLC (top center); History Colorado, William Henry Jackson Collection, 94.367.4, 10045242 (top right); The Denver Public Library, Western History Collection, GB-8294 (center left); Shutterstock, Images by Dr. Alan Lipkin (bottom left); Alamy © age footstock (bottom right)

Niki Hayden (chapter opening); Pixabay (Student Handout, p. 1)

Chapter 1
Wikimedia, John Fowler (chapter heading); Freestock (Student Handout 1, p. 1); Pixabay (Student Handout 1, p. 2); Shutterstock, pringletta (Student Handout 3); Shutterstock, Kellis (Student Handout 4); Shutterstock, AridOcean (Student Handout 5); Bill Nelson (Student Handout 6 and answer key)

Chapter 2
National Park Services (chapter heading); Bill Nelson (Student Handout 1); Shutterstock, Honza Hruby (Student Handout 5)

Chapter 3
Eric Carlson (chapter heading); Shutterstock, James Daniels (Student Handout 1, pp. 1–2); Pixabay (Student Handout 2); Wikimedia (Student Handout 5)

Chapter 4
Wikimedia, Ulrich Egert (chapter heading); Shutterstock, phipatbig (Student Handout 4); Shutterstock, Pinkyone (Student Handout 5)

Denver Public Library, Western History Collection, H-461 (chapter heading)

Chapter 5
History Colorado, 90.156.570, 20030443 (chapter heading); Shutterstock, AKIllustration (Student Handout 1); Shutterstock, FrimuFilms (Student Handout 5); Shutterstock, Kazakova Maryia (Student Handout 6)

Chapter 6
Wikimedia, Gift of Mrs. Sidney T. Miller (chapter heading); Shutterstock, Morphart Creation (Student Handout 2, p. 1); Pixabay (Student Handout 2, pp. 2–3); Shutterstock, pinare (Student Handout 2, p. 4); Shutterstock, The_Pixel (Student Handout 4); Shutterstock, (Student Handout 7)

Chapter 7
Alamy © North Wind Picture Archives (chapter heading and Student Handout 4); Denver Public Library, Western History Collection, F-22692 (Student Handout 1); Shutterstock, Andrey_Kuzmin (Student Handout 3); History Colorado, PH.PROP.2057, 10028698 (chapter heading-5); Shutterstock, Tatiana Kasyanova (Student Handout 6); Wikimedia (Student Handout 9, p. 1); Shutterstock, Everett Historical (Student Handout 9, p. 2); Shutterstock, Popel Arseniy (Student Handout 10)

Chapter 8
History Colorado, Trinidad, CO, Ph.00422, 10027185 (chapter heading); History Colorado, Agriculture-Irrigation, PH.PROP.633, 10029692 (Student Handout 1: Group B); Shutterstock, Nikiteev_Konstantin (Student Handout 1: Group C); Shutterstock, VIGE.CO (Student Handout 1: Group D); Shutterstock, Leon Rafael (Student Handout 1: Group F); Shutterstock, Karoli (Student Handout 1: Group G); Pixabay (Student Handout 1: Group H); Shutterstock, effrosyni (Student Handout 1: Group I)

Shutterstock, farbled (chapter heading)

Chapter 9
History Colorado, Tintype Collection, 86.70.124, 10025298 (chapter heading); Shutterstock, RetroClipArt (Student Handout 1); Shutterstock, R-studio (Student Handout 3, p. 1); Shutterstock, Mark Carrel (Student Handout 3, pp. 2–3); Pixabay (Student Handout 4); Shutterstock, berkut (Student Handout 5, top); Shutterstock, m03goff (Student Handout 5, bottom)

Chapter 10
Denver Public Library, Western History Collection, chapter headingS-B1026 (chapter heading); Shutterstock, I. Pilon (Student Handout 1: Part B); Shutterstock, owatta (Student Handout 4)

Government and Citizenship
Shutterstock, bikeriderlondon (chapter heading)

Chapter 11
Denver Public Library, Western History Collection, Z-102 (chapter heading); Ariana Rinken (Student Handout 5, pp. 1–3); Shutterstock, Katya Ershova (Student Handout 5, p. 1); Wikimedia (Student Handout 5, p. 2)

Chapter 12
Shutterstock, Arina P Habich (chapter heading); Shutterstock, Tropinina Olga (Student Handout 2, p. 1); Shutterstock, Hunor Olah (Student Handout 2, p. 2); Shutterstock, Leremy (Student Handout 3); Shutterstock, Lorelyn Medina (Student Handout 4)