de Posadas joins Argentina's Second Triumvirate. 1839 – The French government announces that Louis Daguerre's photographic process is a gift "free to the world". 1848 – California Gold Rush: The New York Herald breaks the news to the East Coast of the United States of the gold rush in California (although the rush started in January). 1854 – The First Sioux War begins when United States Army soldiers kill Lakota chief Conquering Bear and in return are massacred. 1861 – First ascent of Weisshorn, fifth highest summit in the Alps. 1862 – Dakota War: During an uprising in Minnesota, Lakota warriors decide not to attack heavily defended Fort Ridgely and instead turn to the settlement of New Ulm, killing white settlers along the way. 1901–present 1909 – The Indianapolis Motor Speedway opens for automobile racing. Wilfred Bourque and his mechanic are killed during the first day's events. 1920 – The Tambov Rebellion breaks out, in response to the Bolshevik policy of Prodrazvyorstka. 1927 – Patriarch Sergius of Moscow proclaims the declaration of loyalty of the Russian Orthodox Church to the Soviet Union. 1934 – The first All-American Soap Box Derby is held in Dayton, Ohio. 1934 – The German referendum of 1934 approves Adolf Hitler's appointment as head of state with the title of Führer. 1936 – The Great Purge of the Soviet Union begins when the first of the Moscow Trials is convened. 1940 – First flight of the B-25 Mitchell medium bomber. 1941 – Germany and Romania sign the Tiraspol Agreement, rendering the region of Transnistria under control of the latter. 1942 – World War II: Operation Jubilee: The 2nd Canadian Infantry Division leads an amphibious assault by allied forces on Dieppe, France and fails, many Canadians are killed or captured. The operation was intended to develop and try new amphibious landing tactics for the coming full invasion in Normandy. 1944 – World War II: Liberation of Paris: Paris, France rises against German occupation with the help of Allied troops. 1945 – August Revolution: Viet Minh led by Ho Chi Minh take power in Hanoi, Vietnam. 1953 – Cold War: The CIA and MI6 help to overthrow the government of Mohammad Mosaddegh in Iran and reinstate the Shah Mohammad Reza Pahlavi. 1955 – In the Northeast United States, severe flooding caused by Hurricane Diane, claims 200 lives. 1960 – Cold War: In Moscow, Russia, Soviet Union, downed American