1. In 1933, the infamous "Black Sunday" dust storm swept across Oklahoma, causing immense damage to crops, homes, and infrastructure. It is considered one of the worst dust storms in American history and a stark reminder of the environmental challenges faced by Oklahoma during the Dust Bowl years.

2. On April 1, 1946, a deadly tornado struck the town of Tupelo, Oklahoma, killing 233 people and injuring over 600 more. It was one of the deadliest tornadoes in American history, and led to improved understanding and preparation for severe weather events in the future.

3. In 1984, a statue of "Sacajawea and Child" was unveiled in Oklahoma City's Bricktown district. The sculpture, which depicts the famous Native American explorer and her son, has become an iconic symbol of Oklahoma's diverse cultural heritage.

4. On April 1, 2000, the Oklahoma City Thunder NBA team played their first game in the newly-built Chesapeake Energy Arena. The team has since become a beloved part of Oklahoma's sports culture, and helped to revitalize downtown Oklahoma City.

5. In 2016, Oklahoma Governor Mary Fallin declared April 1 "Redbud Day," in honor of the state tree that blooms throughout the state in the spring. The redbud is a beloved symbol of Oklahoma's natural beauty, and is celebrated in festivals and events throughout the state.