President James K. Polk announces the ratification of the Oregon Treaty, settling one of the most contentious territorial disputes in American history. Signed on June 15, 1846, and officially ratified by both the United States and Great Britain by August 5, the treaty carves the Pacific Northwest in half along the 49th parallel, giving America present-day Washington, Oregon, and Idaho while Britain keeps Canada. The agreement ends decades of "doubt and uncertainty" over who owned this vast, resource-rich territory. Secretary of State James Buchanan and British envoy Richard Pakenham negotiated the delicate compromise, which guarantees free navigation rights on shared waterways and protects the Hudson's Bay Company's existing property claims. The proclamation also includes a separate treaty with the Pottawatomie, Chippewa, and Ottawa nations, forcing the consolidated Pottawatomie Nation to cede all their Iowa lands and relocate to Kansas in exchange for $850,000 and a 576,000-acre reservation.

August 1846 marks a pivotal moment in American westward expansion. The Oregon Treaty resolved peacefully what many feared would spark war with Britain—"54-40 or Fight!" had been the rallying cry of aggressive expansionists demanding the entire territory up to Alaska's border. Polk's compromise satisfied neither wing of his party but prevented catastrophic conflict. Simultaneously, the Pottawatomie removal exemplifies the Indian Removal Act's brutal machinery: consolidating tribes into a single "nation," liquidating their Eastern lands, and forcing westward migration under the guise of "parental protection." Together, these documents show America's continental ambitions unfolding through diplomacy with Europeans and coercion with Native peoples—setting the stage for the Mexican-American War (already underway) and the sectional crisis over slavery's expansion into these newly claimed territories.

• The treaty guarantees 'free and open' navigation of the Columbia River for British subjects and the Hudson's Bay Company 'with their goods and produce'—a remarkable concession that allowed British fur traders to operate deep inside American territory for commercial purposes.
• The Pottawatomie are offered only $50,000 upfront (after ratification) from their $850,000 total payment to 'arrange their affairs, and pay their just debts before leaving their present homes'—suggesting the government acknowledged these tribes had accumulated significant financial obligations.
• Article 8 authorizes the President to pay the Pottawatomie their annual interest 'in lieu of the employment of persons or purchase of machines or implements'—essentially allowing the government to convert promised infrastructure investments into straight cash payments.
• The treaty specifies that removal must occur 'within two years,' with $20,000 allocated for upper bands at $10 per head and $10,000 for lower bands at $5 per head—revealing detailed per-capita calculations that expose the government's bureaucratic approach to forced relocation.
• The Pottawatomie agreed to pay the United States $87,000 for their new Kansas reservation from the aggregate sum owed to them—a fascinating reversal where dispossessed peoples effectively purchased their own exile lands.

• James Buchanan, negotiating the Oregon Treaty as Secretary of State, would become President just eleven years later—only to preside over the nation's collapse into Civil War, making his diplomatic skill in 1846 all the more poignant.
• The 49th parallel boundary established here remains the longest undefended border in the world; the only modification came in 1872 when the Treaty of Washington gave Britain the San Juan Islands, a compromise most Americans forgot they'd lost.
• The Pottawatomie Nation's promised $850,000—an enormous sum in 1846—was to be held 'in trust' earning 5% annual interest, but this trust structure meant the government controlled the principal while Indians received only income, a financial arrangement that persisted for decades.
• The treaty explicitly protects the Puget's Sound Agricultural Company's farms on the Columbia, recognizing private British corporate holdings within U.S. territory—a stunning concession to a commercial enterprise that shows how fur-trade companies wielded geopolitical power.
• Just three months after this Oregon settlement, the Mexican-American War had been underway for weeks; the U.S. would soon claim the Southwest, making 1846 the year of continental seizure on both north and south borders.