1. On March 22, 1836, the Battle of Hidalgo began, marking the start of the Mexican-American War. It was fought near the town of Hidalgo, which is located in present-day Texas.

2. On the same day in 1875, the state of Texas adopted its first constitution. This document established the framework for the government of Texas, including its laws and regulations.

3. March 22, 1962, marked the first time that the Texas Rangers were officially recognized as a law enforcement agency. The Rangers had played a vital role in Texas history for many years before this, but their status as a formal law enforcement agency was not recognized until this date.

4. On March 22, 1997, the Houston Livestock Show and Rodeo set a new attendance record. Over 1.4 million people attended the annual event, which had been held in Houston since 1932.

5. March 22, 2018, was a historic day for the city of Austin, as the city council voted to rename a street after a beloved musician. South Congress Avenue was renamed Willie Nelson Boulevard in honor of the legendary singer, who had lived and performed in Austin for many years.