This book walks readers through the improvements made to navigational instruments and printing techniques since the Age of Exploration. The development of accuracy in cartography-from Martin Waldseemüller's map of the world, the Mercator projection, and Lewis and Clark's expedition to railroad surveys, roadmaps, satellite imaging, and GIS technology-is also discussed. Readers will also discover ways mapmaking has impacted the history of the United States, including Mountain Men and the discovery of South Pass, the Oregon Trail, and the 49th parallel. Colorful maps and diagrams highlight the text, demonstrating these innovations and milestones. Informative sidebars, bold glossary terms, and an index enhance the engaging text and graphics.