1. The Alamo fell on March 15, 1836, marking a pivotal moment in Texas history. Mexican forces led by General Antonio López de Santa Anna overwhelmed the Texian defenders, leading to the slaughter of nearly all of them.

2. On March 15, 1845, the US Congress voted to annex Texas as the 28th state. This decision was contentious at the time, with tensions running high between pro-slavery and anti-slavery factions in the United States.

3. March 15, 1917 saw the opening of the Great War exhibit at the Texas State Fairgrounds in Dallas. The exhibit showcased the latest military technology and was intended to boost morale and support for the war effort.

4. In 1933, the Texas Legislature passed the first state-level minimum wage law, which went into effect on March 15 of that year. The law required employers to pay workers at least 25 cents per hour and was seen as a major victory for labor activists.

5. March 15, 1942 marked the beginning of the "Texas War on Bugs," a coordinated effort by the state government and agricultural industry to combat insect pests that were devastating crops and livestock. This initiative led to the development of new insecticides and pest management techniques that transformed agriculture in Texas and beyond.