Timeline Assignment By EEmilyMartinez59 1900 Frontier Batalion of Texas Rangers is dissolved 1901 Bluebonnet is named state flower. 1901 Discovery of “black gold” at the Sprindletop oil field. 1902 Poll tax becomes a requirement for voting. 1919 Texas adopts the 19th Amendment. 1943 Beaumont Riot. 1954 Brown v. Board of Education and the end of segregation in schools. 1963 President JFK is assassinated in Dallas, Texas. 1981 Oil prices peaks; Texas state economy booms. 1990 Democrat Ann Richards becomes the first woman governor of Texas.in her own right