French physicist Augustin Fresnel signs his preliminary "Note on the Theory of Diffraction" (deposited on the following day). The document ends with what we now call the Fresnel integrals. 1839 – The Treaty of London establishes Belgium as a kingdom and guarantees its neutrality. 1861 – American Civil War: Baltimore riot of 1861: A pro-Secession mob in Baltimore attacks United States Army troops marching through the city. 1901–present 1903 – The Kishinev pogrom in Kishinev (Bessarabia) begins, forcing tens of thousands of Jews to later seek refuge in Palestine and the Western world. 1927 – Mae West is sentenced to ten days in jail for obscenity for her play Sex. 1942 – World War II: In German-occupied Poland, the Majdan-Tatarski ghetto is established, situated between the Lublin Ghetto and a Majdanek subcamp. 1943 – World War II: In German-occupied Poland, the Warsaw Ghetto Uprising begins, after German troops enter the Warsaw Ghetto to round up the remaining Jews. 1943 – Albert Hofmann deliberately doses himself with LSD for the first time, three days after having discovered its effects on April 16. 1956 – Actress Grace Kelly marries Prince Rainier of Monaco. 1960 – Students in South Korea hold a nationwide pro-democracy protest against president Syngman Rhee, eventually forcing him to resign. 1971 – Sierra Leone becomes a republic, and Siaka Stevens the president. 1971 – Launch of Salyut 1, the first space station. 1971 – Charles Manson is sentenced to death (later commuted to life imprisonment) for conspiracy in the Tate–LaBianca murders. 1973 – The Portuguese Socialist Party is founded in the German town of Bad Münstereifel. 1975 – India's first satellite Aryabhata launched in orbit from Kapustin Yar, Russia. 1975 – South Vietnamese forces withdrew from the town of Xuan Loc in the last major battle of the Vietnam War. 1984 – Advance Australia Fair is proclaimed as Australia's national anthem, and green and gold as the national colours. 1985 – Two hundred ATF and FBI agents lay siege to the compound of the white supremacist survivalist group The Covenant, the Sword, and the Arm of the Lord in Arkansas; the CSA surrenders two days later. 1987 – The Simpsons first appear as a series of shorts on The Tracey Ullman Show, first starting with "Good Night". 1989 – A gun turret explodes on the , killing 47 sailors. 1993 – The 51-day FBI siege of the Branch Davidian