Portal:United States/Anniversaries/June/June 15
- 1752 – Benjamin Franklin proves that lightning is electricity.
- 1836 – Arkansas is admitted as the 25th U.S. state.
- 1844 – Charles Goodyear receives a patent for vulcanization, a process to strengthen rubber.
- 1846 – The Oregon Treaty establishes the 49th parallel as the border (pictured) between the United States and Canada, from the Rocky Mountains to the Strait of Juan de Fuca.
- 1864 – Arlington National Cemetery is established when 200 acres (0.81 km2) around Arlington Mansion, formerly owned by Confederate General Robert E. Lee, are officially set aside as a military cemetery by U.S. Secretary of War Edwin M. Stanton.
- 1916 – U.S. President Woodrow Wilson signs a bill incorporating the Boy Scouts of America, making them the only American youth organization with a federal charter.
On this day for the United States
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Events
- 1752 – Benjamin Franklin proves that lightning is electricity.
- 1775 – American Revolutionary War: George Washington is appointed commander–in–chief of the Continental Army.
- 1776 – Delaware Separation Day – Delaware votes to suspend government under the British Crown and separate officially from Pennsylvania.
- 1804 – New Hampshire approves the Twelfth Amendment to the United States Constitution, ratifying the document.
- 1836 – Arkansas is admitted as the 25th U.S. state.
- 1844 – Charles Goodyear receives a patent for vulcanization, a process to strengthen rubber.
- 1846 – The Oregon Treaty establishes the 49th parallel north as the border between the United States and Canada, from the Rocky Mountains to the Strait of Juan de Fuca.
- 1864 – American Civil War: Siege of Petersburg begins.
- 1864 – Arlington National Cemetery is established when 200 acres (0.8 km²) around Arlington Mansion are officially set aside as a military cemetery by U.S. Secretary of War Edwin M. Stanton.
- 1867 – Atlantic Cable Quartz Lode gold mine located in Montana.
- 1877 – Henry Ossian Flipper becomes the first African American cadet to graduate from the United States Military Academy.
- 1904 – A fire aboard the steamboat General Slocum in New York City's East River kills 1000.
- 1911 – Computing Tabulating Recording Company (IBM) is incorporated.
- 1916 – U.S. President Woodrow Wilson signs a bill incorporating the Boy Scouts of America, making them the only American youth organization with a federal charter.
- 1920 – Duluth lynchings in Minnesota.
- 1934 – The U.S.'s Great Smoky Mountains National Park is founded.
- 1944 – World War II: Battle of Saipan: The United States invades Saipan.
- 1954 – UEFA (Union des Associations Européennes de Football) is formed in Basle, Switzerland.
- 1955 – The Eisenhower administration stages the first annual "Operation Alert" (OPAL) exercise, an attempt to assess the USA's preparations for a nuclear attack.
- 1992 – The United States Supreme Court rules in United States v. Álvarez–Machaín that it is permissible for the USA to forcibly extradite suspects in foreign countries and bring them to the USA for trial, without approval from those other countries.