The pig that almost started a war: How a pig shot in 1859 turned a San Juan Island farm dispute into a 12-year Britain-America standoff

In 1859, a single pig turned a quiet island dispute into a tense confrontation between two powerful nations. What began as a farmer’s frustration over a wandering animal on San Juan Island quickly escalated into a military standoff involving British warships, American soldiers and competing territorial claims. The disagreement was rooted in a much older problem; an unclear boundary created by the 1846 Oregon Treaty. For 12 years, Britain and the United States maintained rival camps on the island but avoided open conflict. Known as the Pig War, the unusual crisis was eventually resolved through diplomacy and arbitration, leaving behind one of history’s strangest border disputes.How the 1846 Oregon Treaty created a territorial dispute over the San Juan IslandsAs reported by the National Park Service (NPS), the roots of the dispute stretched back to 1846, when Britain and the United States signed the Oregon Treaty to settle competing claims in the Pacific Northwest. The agreement placed the boundary between the two countries along the 49th parallel, but its wording created a problem.The treaty referred to a channel separating the mainland from Vancouver Island before the boundary cont...