1. On August 13, 1838, the Texas Congress approved the establishment of the Texas Rangers, a legendary law enforcement agency known for its pursuit of outlaws and protection of settlers.

2. In 1846, on August 13, the United States declared war on Mexico, initiating the Mexican-American War, which ultimately led to Texas becoming a state.

3. On August 13, 1889, the world's first rodeo was held in Pecos, Texas. The event drew in contestants from across the state and became an annual tradition.

4. August 13, 1961, marked the opening of the San Antonio Zoological Gardens and Aquarium. The zoo has been a beloved attraction for locals and tourists alike, featuring over 3,500 animals and more than 750 species.

5. On August 13, 2019, Texas experienced a major power outage when a heat wave caused record-breaking demands for electricity. The power grid was strained to its limits, leading to rolling blackouts across the state.