1. On July 20, 1969, astronaut Neil Armstrong, a native Texan from Wapakoneta, Ohio, became the first human being to set foot on the moon during the historic Apollo 11 mission.

2. On July 20, 1867, the first cattle drive from Texas to Kansas began in Blanco County. This marked the beginning of the era of the cattle drives that would last until the late 1880s and contribute to the development of the Texas cattle industry.

3. On July 20, 1845, Texas officially became the 28th state of the United States. The annexation of Texas was a controversial issue that had been debated for years, with some fearing Texas' admission would lead to a war with Mexico.

4. On July 20, 1877, outlaw Sam Bass staged a robbery of the Union Pacific Railroad in Big Springs, Texas. The robbery was unsuccessful, but it marked the beginning of Bass' brief career as an outlaw and his ensuing showdown with Texas Rangers.

5. On July 20, 1929, Vincent F. Schaefer, a meteorologist from Schenectady, New York, conducted the first successful cloud-seeding experiment in the world near San Antonio, Texas. This marked a major breakthrough in the field of weather modification and paved the way for further research in the area.