1. The first oil well in Texas was found on March 7, 1866. The well, located in Nacogdoches County, produced only small amounts of oil, but it was significant in that it marked the beginning of the state's major oil industry.

2. In 1876, the Texas Legislature passed the Frontier Battalion Act on March 7th, which created a group of lawmen tasked with fighting Native American raiders along the Texas frontier. These lawmen became known as the famous Texas Rangers.

3. On March 7, 1901, the first Hague Convention was signed in The Hague, Netherlands. Texas was one of the countries that signed the treaty, which established guidelines for the peaceful settlement of international disputes.

4. On this day in 1960, Texas billionaire H. L. Hunt became the richest man in the world according to Forbes magazine. His wealth was estimated at $1.5 billion, making him the first person to ever hold that title.

5. In 1984, Texan astronaut Bruce McCandless became the first person to fly untethered in space as he floated outside the Space Shuttle Challenger. His mission lasted for over four hours, and it helped pave the way for future spacewalks and extravehicular activities.