1. Indiana Became a State on April 15, 1816: On this day, Indiana officially became a state, making it the 19th state to join the Union. To celebrate this occasion, the Indiana Bicentennial Commission organized a series of events in 2016, including a torch relay that traveled through all 92 counties in the state.

2. Abraham Lincoln Died on April 15, 1865: Abraham Lincoln, the 16th President of the United States, was assassinated on April 14, 1865, but he did not die until the following day. He was shot while attending a play at Ford's Theatre in Washington, D.C. and died the next morning at the Petersen House.

3. The Indianapolis 500 Was First Held on April 15, 1911: The Indianapolis 500 is one of the most famous motor races in the world, and it was first held on April 15, 1911, at the Indianapolis Motor Speedway. The race has been held every year since, except for during the World War I and World War II years.

4. The Notre Dame Cathedral Fire Occurred on April 15, 2019: On April 15, 2019, a fire broke out at the Notre Dame Cathedral in Paris, France, causing significant damage to the historic landmark. The fire was believed to have been caused by an electrical short circuit.

5. Indiana Pacers Won Their First NBA Playoff Game on April 15, 1994: The Indiana Pacers, a professional basketball team based in Indianapolis, won their first NBA playoff game on April 15, 1994. They defeated the Orlando Magic 107-105 in the first round of the playoffs. The Pacers have since won three conference championships and made six NBA Finals appearances.