of the Diplodocus carnegii dinosaur. May 15 – Las Vegas, Nevada, is founded when of land adjacent to the Union Pacific Railroad tracks are auctioned to what is now today Downtown Las Vegas. May 22 – Abdul Hamid II, the Sultan of the Ottoman Empire establishes the Ullah Millet for the Aromanians of the empire. For this reason, the Aromanian National Day is sometimes celebrated on this day. The decision is publicly announced the next day, which is more commonly celebrated. May 28 – At the end of two days in fighting in the Battle of Tsushima, the Russian Imperial Navy has suffered the deaths of more than 14,000 of the 18,000 sailors and officers it had brought to the battle, and all but four of its Pacific ships. The Japanese loss is three torpedo boats and 800 men. May 29 – Brooklyn Superbas pitcher Elmer Stricklett introduces the "spitball" to major league baseball. May 30 – Japan's Prime Minister Katsura Tarō asks U.S. President Theodore Roosevelt to moderate peace discussions to end the Russo-Japanese War. June June 1 The Lewis and Clark Exposition opens in Portland, Oregon. The Sultan of Morocco rejects France's demands for a scheme of reforms. June 6 – In Germany's last royal wedding, Crown Prince Wilhelm, son of Kaiser Wilhelm II and heir to the throne, marries Duchess Cecilie of Mecklenburg-Schwerin at Berlin. June 7 – The Norwegian Parliament, the Storting, declares dissolution of the union between Norway and Sweden, giving Norway full independence. June 13 – Theodoros Diligiannis, Prime Minister of Greece, is assassinated. June 15 – British Princess Margaret of Connaught marries Prince Gustaf Adolf of Sweden, Duke of Skåne, the future King Gustaf VI Adolf. June 18 – A coal mine explosion in Russia kills 500 employees at the Ivan Colliery at Kharsisk. June 20 – Dr. Ernest Henry Starling introduces the word "hormone" into the English language. June 21 – New York Central Railroad's 20th Century Limited train is derailed in an apparent act of sabotage, killing 21 people. June 25 – The Danish Navy training ship Georg Stage is accidentally sunk after a collision with the English steamship Ancona, killing 22 teenaged recruits. June 27 – (June 14 O.S.): Mutiny breaks out on the Russian ironclad Potemkin. June 28 – "Pomp and Circumstance" is first played as a graduation march, after Yale University music professor Samuel Sanford invited its composer,