Expansion into the West
Dec 2 US President James K. Polk announces to Congress that the United States should aggressively expand into the West, a widely held belief termed "manifest destiny" by newspaper editor John O'Sullivan
- Dec 6 Alpha Sigma Phi Fraternity is founded at Yale College.
Leichhardt Survives Overland Expedition
Dec 17 German explorer Ludwig Leichhardt arrives in Port Essington after a nearly 4,800 km (3,000 mi) overland journey to explore Australia's Northern Territory
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