A Short History of the Department of State

• 1830–1860: Diplomacy and Westward Expansion
• Indian Treaties and the Removal Act of 1830
• The Amistad Case, 1839
• The Opening to China Part I: the First Opium War, the United States, and the Treaty of Wangxia, 1839–1844
• Webster-Ashburton Treaty, 1842
• The Oregon Territory, 1846
• The Annexation of Texas, the Mexican-American War, and the Treaty of Guadalupe-Hidalgo, 1845–1848
• Founding of Liberia, 1847
• United States Maritime Expansion across the Pacific during the 19th Century
• Gadsden Purchase, 1853–1854
• The United States and the Opening to Japan, 1853
• The Opening to China Part II: the Second Opium War, the United States, and the Treaty of Tianjin, 1857–1859
• Territorial Expansion, Filibustering, and U.S. Interest in Central America and Cuba, 1849–1861