Click on the numbers for more information on this map of the Donner Party’s route from Independence, Missouri to Sutter’s Fort, California.
The worldwide migration by eager gold-seekers turned California into a land of opportunity and fierce competition.
President Theodore Roosevelt was caught in the middle of the first major battle for wilderness preservation in Yosemite National Park.
The ultimate frontiersman, Carson inspired popular novels before being associated with the "Long Walk" of the Navajo people.
John Wesley Powell's epic journey into the unknown Grand Canyon was filled with adventure as his team mapped the Colorado River for the first time.
During the Great Depression, Americans built the Hoover Dam, one of the greatest engineering works in history.
In the early 1830s, Texas, ruled by Mexico, held 20,000 U.S. settlers and 4,000 Mexican Tejanos, forcing residents to pick sides.
The contradictory history of a dam that became a statement of American power and prestige.
The epic battle waged over dinosaur fossils by rival paleontologists in the American West.