Manifest Destiny

Louisiana Purchase 

• Louisiana Purchase history - National Park Service
• Louisiana Purchase treaty - Our Documents 
• Westward Expansion: the Louisiana Purchase - Independence Hall Association  

Erie Canal

• Building the Big Apple - PBS Kids
• Erie Canal Time Machine - New York State Archives
• The Erie Canal: A Brief History - NY State Canals

Lewis and Clark Expedition

• Corps of Discovery - PBS
• Lewis and Clark - National Geographic 
• Lewis and Clark: Overview and Documents - National Archives 
• Lewis and Clark 101 

Indian Removal

Indian Removal/Trail of Tears 

• Indian Removal 1814-1858 - PBS 
• Cherokee Removal and the Trail of Tears - LEARN NC/North Carolina Digital History
• Andrew Jackson's Second Annual Message - PBS 
• Cherokee letter protesting Treaty of New Echota - PBS 
• Archaeology Dig article - National Geographic

Indian Territory

• Archival Map of Indian Territory - The West/PBS
• Freedmen: slaves owned by the Five Civilized Tribes in Indian Territory -  Encyclopedia of Oklahoma History & Culture/Oklahoma Historical Society

Slavery

Missouri Compromise, Henry Clay, and the Expansion of Slavery

• Missouri Compromise - Encyclopedia Britannica

* Map of Missouri Compromise, Compromise of 1850, and Kansas-Nebraska Act - Encyclopedia Britannica

• The Expansion of Slavery and the Missouri Compromise - LEARN NC
• A Shifting Political Landscape: Missouri Compromise, Compromise of 1850, and Kansas-Nebraska Act of 1854 - PBS
• Primary Documents in American History: Missouri Compromise - Library of Congress

Slave Rebellions

• Slave Rebellions: A Timeline - Independent Lens/PBS
• Nat Turner's Rebellion - LEARN NC/North Carolina Digital History
• Nat Turner's Rebellion: "To rebel and make insurrection" -  The Library of Virginia
• Nat Turner: A Troublesome Property - Independent Lens/PBS

Inventions

• Eli Whitney and the Cotton Gin - LEARN NC/North Carolina Digital History
• Eli Whitney's Cotton Gin - History Wired/Smithsonian Institution
• Eli Whitney's Patent for the Cotton Gin - Teaching with Documents/National Archives
• Samuel F.B. Morse and Morse Code - Inventor of the Week/MIT
• Samuel Morse: A Better Telegraph - Who Made America?/PBS