Arthur P. Jacobs —
Photo Credit: By Source (WP:NFCC#4), Fair use, https://en.wikipedia.org/w/index.php?curid=39947329

Hugh Lofting —
Photo Credit: https://www.goodreads.com/author/show/70762.Hugh_Lofting

First edition cover of The Story of Doctor Dolittle —
Photo Credit: By http://www.abebooks.co.uk/servlet/BookDetailsPL?bi=8180577585, PD-US-expired, https://en.wikipedia.org/w/index.php?curid=6557847

Santa Fe Trail logo —
Photo Credit: https://www.nps.gov/safe/index.htm

Map of Santa Fe Trail —
Photo Credit: By United States National Park Service-Map, Robert McGinnis-illustration - Public Domain, https://commons.wikimedia.org/w/index.php?curid=18223016

Early photo (possibly the first) of Kit Carson —
Photo Credit: By Unknown photographer - Public Domain, https://commons.wikimedia.org/w/index.php?curid=35904566

Kit Carson —
Photo Credit: By Unknown author - Public Domain, https://commons.wikimedia.org/w/index.php?curid=12878413

Kit Carson by William Ranney, 1854 —
Photo Credit: By William Ranney (1813-1857) - Public Domain, https://commons.wikimedia.org/w/index.php?curid=32891552

Westward the Course of Empire Takes Its Way — Also known as Westward Ho, Emanuel Gottlieb Leutze's 1861 mural symbolizes Manifest Destiny. It is painted behind the western staircase of the House of Representatives and measures 20-by-30-feet (6.1 m × 9.1 m).
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=20625887

seal of Navajo Nation —
Photo Credit: By Bassoonstuff (Bobby C. Hawkins) - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=28948326

Buffalo Bill, ca.1875 —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=6937430