June 15 in History

English barons forced King John to affix his seal to Magna Carta at Runnymede on June 15, 1215, after a rebellion triggered by his heavy taxation and arbitrary justice. The charter contained 63 clauses, most dealing with feudal land rights and tax limits. Clause 39, guaranteeing that no free man would be imprisoned "except by the lawful judgment of his peers or by the law of the land," became the foundation of due process. Clause 40, "to no one will we sell, to no one will we deny or delay right or justice," remains in English law today. Pope Innocent III annulled the charter within months, and civil war erupted. Magna Carta was reissued with modifications after John's death in 1216 and became embedded in English law. Its principles influenced the US Constitution, the Universal Declaration of Human Rights, and legal systems worldwide.

Benjamin Franklin's famous kite experiment, demonstrating that lightning is electrical, probably took place in June 1752, though the exact date is debated and some historians question whether it occurred at all. Franklin described the experiment in a letter published in the Pennsylvania Gazette on October 19, 1752, explaining that he flew a kite during a thunderstorm with a metal key attached to the string. When he touched the key, he felt an electrical charge, proving that lightning was electricity. A year earlier, Thomas-Francois Dalibard had successfully performed a similar experiment in France using Franklin's published instructions. Franklin subsequently invented the lightning rod, which he refused to patent, believing scientific discoveries should benefit humanity freely. The lightning rod was one of the first practical applications of electrical science.

The Oregon Treaty, signed on June 15, 1846, established the 49th parallel as the boundary between British North America and the United States from the Rocky Mountains to the Strait of Georgia, with Vancouver Island remaining entirely British. The treaty resolved the "Oregon Question," which had been a source of tension since both nations jointly occupied the region under the Convention of 1818. American expansionists had campaigned under the slogan "Fifty-Four Forty or Fight," demanding the entire territory up to Russian Alaska. President James K. Polk, simultaneously pursuing war with Mexico, compromised at the 49th parallel. The treaty was significant for establishing what became the world's longest undefended border and for its peaceful resolution of a territorial dispute that might easily have led to a third Anglo-American war.

Secretary of War Edwin Stanton designated 200 acres of Robert E. Lee's former estate in Arlington, Virginia, as a military cemetery on June 15, 1864. Quartermaster General Montgomery Meigs, who despised Lee as a traitor, deliberately placed graves close to the house to ensure Lee could never return to live there. The first military burial had actually occurred a month earlier, on May 13. By the end of the Civil War, over 16,000 soldiers were buried at Arlington. The cemetery has since become America's most hallowed burial ground, with over 400,000 interments including President John F. Kennedy, whose grave features an eternal flame. The Tomb of the Unknown Soldier, established in 1921, is guarded 24 hours a day by soldiers of the 3rd US Infantry Regiment.

Charles Goodyear received US Patent No. 3,633 on June 15, 1844, for the vulcanization of rubber, a process he had discovered accidentally in 1839 when he dropped a mixture of rubber and sulfur on a hot stove. Before vulcanization, natural rubber was commercially useless: it melted in heat, cracked in cold, and stuck to everything. Goodyear had been obsessed with solving this problem for years, going through bankruptcy and debtors' prison. Vulcanization transformed rubber into a stable, elastic material by creating cross-links between polymer chains. Despite the patent, Goodyear spent most of his life in litigation against infringers and died $200,000 in debt in 1860. The Goodyear Tire and Rubber Company, founded 38 years after his death, was named in his honor but had no connection to his family.

The Continental Congress unanimously appointed George Washington as commander-in-chief of the Continental Army on June 15, 1775, one day after creating the army itself. John Adams nominated Washington, reasoning that a Virginian commanding an army of New Englanders would bind the Southern colonies to the revolutionary cause. Washington accepted the position and refused all salary, asking only that Congress reimburse his expenses, which he meticulously documented and eventually submitted as a bill for over $400,000. He took command of the army at Cambridge, Massachusetts, on July 3 and spent the next year transforming an undisciplined militia into something approaching a professional force. Washington's willingness to serve without pay established a powerful precedent about civilian leadership and public service.