What happend on 15th June

14.06
16.06
1905

Princess Margaret of Connaught marries Gustav, Crown Prince of Sweden.

1904

A fire aboard the steamboat General Slocum in New York City's East River kills 1000.

1877

Henry Ossian Flipper becomes the first African American cadet to graduate from the United States Military Academy.

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.

1864

American Civil War: Battle of Petersburg begins – Union forces under General Ulysses S. Grant and troops led by Confederate General Robert E. Lee battle for the last time.

1859

Pig War: Ambiguity in the Oregon Treaty leads to the "Northwestern Boundary Dispute" between U.S. and British/Canadian settlers.

1846

The Oregon Treaty establishes the 49th parallel as the border between the United States and Canada, from the Rocky Mountains to the Strait of Juan de Fuca.

1844

Charles Goodyear receives a patent for vulcanization, a process to strengthen rubber.

1836

Arkansas is admitted as the 25th U.S. state.

1808

Joseph Bonaparte becomes King of Spain.