1. Juneteenth: June 16, 1865, marked a significant moment in Texas history known as Juneteenth. On this day, Union General Gordon Granger arrived in Galveston and announced that all slaves in Texas were free, more than two years after the Emancipation Proclamation was signed.

2. Mount St. Helens Eruption: On June 16, 1977, a small eruption occurred at the Mount St. Helens volcano in Washington state. This was a precursor to the much larger eruption that would happen in 1980, causing widespread devastation.

3. Texas Flag Day: June 16 is also recognized as Texas Flag Day, commemorating the adoption of the Lone Star flag as the official state flag in 1839.

4. Battle of Dove Creek: On June 16, 1865, the Battle of Dove Creek occurred in what is now Tom Green County, Texas. This conflict between Texas Rangers and Kickapoo Indians resulted in the deaths of several Texans and approximately 30 Kickapoo warriors.

5. First Texas Oil Well: On June 16, 1923, the first commercially successful oil well was drilled in Texas. Known as the Santa Rita No. 1, it was located in Reagan County and produced oil for 68 years.