1900-1920 By SGilreath0409 1901 President McKinley assassinated 1903 The Wright brothers make their first powered flight in the Wright Flyer at Kitty Hawk, North Carolina 1905 Albert Einstein publishes his Theory of Relativity 1908 Ford Model T appears on market 1910 Mann–Elkins Act 1912 Girl Scouts of the USA was started by Juliette Gordon Low 1915 RMS Lusitania sunk Period: 1917 to 1920 First Red Scare, marked by a widespread fear of Bolshevism and anarchism 1918 Armistice agreement ends World War I 1920 19th Amendment, grants women the right to vote