June 15 in History

English barons forced King John to affix his seal to Magna Carta at Runnymede, a meadow along the Thames near Windsor, on June 15, 1215. The charter was the product of a political crisis, not abstract philosophy. John had lost most of England's French territories, imposed crushing taxes to fund unsuccessful military campaigns, and alienated nearly every powerful constituency in the kingdom, from feudal lords to the Church to London's merchant class. Armed rebellion, not enlightenment ideals, brought him to the negotiating table. Archbishop Stephen Langton and a group of rebel barons, calling themselves the "Army of God," drafted the initial terms. Magna Carta contained sixty-three clauses addressing specific grievances: limits on royal taxation without baronial consent, protections for the English Church, guarantees of fair trial, restrictions on the Crown's right to seize property, and regulations on debts owed to Jewish moneylenders. Most clauses dealt with narrow feudal concerns that mattered only to the thirteenth-century aristocracy. Three clauses survived to become the foundation of constitutional law. Clause 39 guaranteed that "no free man shall be seized, imprisoned, dispossessed, outlawed, exiled, or ruined in any way... except by the lawful judgment of his peers or by the law of the land." Clause 40 declared: "To no one will we sell, to no one will we deny or delay right or justice." These principles became the basis for habeas corpus, due process, and trial by jury. John repudiated the charter within weeks, and Pope Innocent III annulled it. Civil war resumed immediately. John died of dysentery in October 1216. His nine-year-old son Henry III reissued Magna Carta repeatedly during his reign, embedding it in English law. Over eight centuries, the document has been invoked by Parliament against the Stuarts, by American colonists against George III, and by the framers of the Universal Declaration of Human Rights.

Benjamin Franklin flew a kite into a thunderstorm sometime in June 1752, probably near Philadelphia, and demonstrated that lightning was electrical in nature. The exact date is unknown, and some historians have questioned whether the experiment happened as traditionally described. Franklin himself did not publish an account until October 1752, in the Pennsylvania Gazette, and the description was notably brief for so dramatic a discovery. No witnesses are named. Franklin had proposed the experiment theoretically in 1750, suggesting that a metal rod placed atop a tall structure could draw electrical charge from storm clouds. French scientists Thomas-Francois Dalibard and Louis-Guillaume Le Monnier successfully performed this "sentry box" experiment in May 1752, confirming Franklin's hypothesis before he conducted his own test. Franklin may not have known about the French results when he flew his kite. The traditional account describes Franklin and his son William flying a silk kite with a metal key attached to the string during a thunderstorm. When Franklin brought his knuckle near the key, he observed a spark, proving that the storm cloud carried an electrical charge. The experiment was extraordinarily dangerous. Georg Wilhelm Richmann, a Swedish physicist working in St. Petersburg, was killed in 1753 while attempting to replicate it, struck by ball lightning that traveled down his experimental apparatus. Franklin's work on electricity had immediate practical consequences. He invented the lightning rod, which was rapidly adopted across Europe and America and saved countless buildings from fire. His electrical research also earned him the Royal Society's Copley Medal and made him the most famous American scientist in Europe, a reputation that proved invaluable when he later served as ambassador to France during the American Revolution.

The Oregon Treaty, signed on June 15, 1846, established the 49th parallel as the boundary between the United States and British North America from the Rocky Mountains to the Strait of Juan de Fuca, resolving a territorial dispute that had threatened to produce a third Anglo-American war. The agreement divided the vast Oregon Country, jointly occupied by both nations since 1818, giving the United States what would become the states of Oregon, Washington, Idaho, and parts of Montana and Wyoming. The dispute had been escalating for years. President James K. Polk had campaigned in 1844 on the belligerent slogan "Fifty-four Forty or Fight," demanding American sovereignty over the entire Oregon Country up to the southern boundary of Russian Alaska at 54 degrees, 40 minutes north latitude. Expansionist Democrats wanted the entire Pacific Northwest. Britain, which had a strong commercial presence through the Hudson's Bay Company and thousands of British subjects in the region, refused to concede territory north of the Columbia River. Polk's aggressive rhetoric masked a willingness to compromise. He was already fighting a war with Mexico that had begun in April 1846 and could not risk a simultaneous conflict with Britain. British Foreign Secretary Lord Aberdeen, similarly eager to avoid war over remote wilderness, proposed the 49th parallel, which had been the boundary east of the Rockies since 1818. The compromise preserved all of Vancouver Island for Britain, even though its southern tip extends below the 49th parallel. The treaty's most lasting consequence was establishing the longest undefended border in the world. The 49th parallel, an arbitrary line on a map with no relationship to geography, culture, or watershed boundaries, became one of the most stable international boundaries in modern history.

Secretary of War Edwin Stanton designated two hundred acres of Robert E. Lee's former estate in Arlington, Virginia, as a military cemetery on June 15, 1864, during the bloodiest phase of the Civil War. The decision was partly practical and partly personal. Washington's existing military cemeteries were running out of space as casualties mounted from Ulysses S. Grant's Overland Campaign, but the choice of Lee's property was also deliberate. Quartermaster General Montgomery Meigs, who despised Lee as a traitor, wanted to ensure that the Confederate general could never return home. Meigs ordered the first graves dug in the rose garden near the Arlington House mansion, specifically to render the property unsuitable for residential use. The first soldier buried at Arlington was Private William Henry Christman of the 67th Pennsylvania Infantry, interred on May 13, 1864, before the formal designation. By the end of the Civil War, over 16,000 Union soldiers were buried on the grounds, along with roughly 1,500 formerly enslaved people who had died at the Freedman's Village established on the property. The Lee family contested the seizure for decades. In 1882, the Supreme Court ruled in United States v. Lee that the government had taken the property without due process. Congress then purchased the estate from Lee's son, George Washington Custis Lee, for $150,000, roughly $4.7 million in today's dollars, legitimizing the cemetery's continued existence. Arlington National Cemetery now covers 639 acres and contains more than 400,000 graves, including those of veterans from every American conflict since the Civil War. President John F. Kennedy is buried there, his grave marked by an eternal flame. The Tomb of the Unknown Soldier, established in 1921, is guarded twenty-four hours a day by soldiers of the 3rd United States Infantry Regiment.

Charles Goodyear received U.S. Patent No. 3,633 on June 15, 1844, for the vulcanization of rubber, a process he had stumbled upon accidentally in 1839 after five years of obsessive, financially ruinous experimentation. Before vulcanization, natural rubber was commercially useless for most purposes. Products made from it melted in summer heat, cracked in winter cold, and decomposed into sticky, foul-smelling masses. Goodyear's process of heating rubber with sulfur produced a material that was durable, elastic, and stable across temperature extremes. Goodyear's path to the discovery was spectacularly difficult. He began experimenting with rubber in the early 1830s after buying a rubber life preserver from the Roxbury India Rubber Company and deciding he could improve it. Over the following years, he exhausted his savings, sold his children's schoolbooks, pawned the family's belongings, and was imprisoned multiple times for unpaid debts. His family endured severe poverty while he pursued one failed rubber treatment after another, mixing the material with magnesium, quicklime, nitric acid, and various other substances. The breakthrough came when Goodyear accidentally dropped a piece of rubber mixed with sulfur onto a hot stove in his workshop. Instead of melting, the rubber charred at the edges but remained flexible and stable in the center. Goodyear spent the next five years refining the temperature and proportions required for consistent results before securing his patent. Goodyear never profited significantly from his invention. Thomas Hancock in England independently developed a vulcanization process and patented it in Britain eight weeks before Goodyear could file there. Patent infringement battles consumed Goodyear's remaining years and finances. He died in 1860 owing approximately $200,000 in debts. The Goodyear Tire and Rubber Company, founded in 1898, 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 voting to create the force. Washington, a forty-three-year-old Virginia planter and veteran of the French and Indian War, attended the session in his military uniform, the only delegate to do so, which historians have interpreted either as a signal of availability or simply as his way of expressing seriousness about the military crisis. John Adams orchestrated the appointment for strategic reasons as much as military ones. New England delegates wanted a southerner in command to bind the southern colonies to what had been, until that point, a predominantly Massachusetts conflict. Washington's selection served that purpose perfectly. He was wealthy, well-connected, carried himself with natural authority, and had more military experience than most colonial officers, though his actual combat record from the 1750s was mixed at best. His most notable engagement, the Battle of Fort Necessity in 1754, had been a defeat. Washington accepted the commission in a speech that combined humility with political shrewdness, declaring that he did not consider himself equal to the command and asking that his expenses rather than a salary be covered. He then traveled to Cambridge, Massachusetts, arriving on July 2 to take formal command of the militia forces besieging Boston. His assessment of what he found was blunt: undisciplined troops, chronic supply shortages, short enlistments, and officers chosen by popularity rather than competence. Over the following eight years, Washington lost more battles than he won. His genius lay not in tactical brilliance but in keeping an army in the field when every rational calculation said it should have dissolved. He held the Continental Army together through defeats, desertions, mutinies, congressional neglect, and the winter at Valley Forge until French intervention tipped the balance.