1. On June 4, 1919, the Indiana state legislature ratified the 19th Amendment to the US Constitution, granting women the right to vote. Indiana was the 26th state to ratify the amendment, helping to secure its passage.

2. In 1968, Robert F. Kennedy won the Democratic presidential primary in Indiana on June 4, just before he was assassinated in California the following day. Kennedy's Indiana victory was seen as a critical turning point in the race for the Democratic nomination.

3. On June 4, 1978, former Indiana University basketball coach Bob Knight won his second NCAA championship, as his team defeated Duke University in the title game. Knight would go on to coach at Indiana University for another 22 seasons, winning three more NCAA championships.

4. The Indianapolis 500, one of the most prestigious auto races in the world, is typically held on the Sunday of Memorial Day weekend each year, which often falls within the first few days of June. On June 4, 1972, Mark Donohue won the Indianapolis 500 driving a McLaren car.

5. On June 4, 1989, the tragedy at Square Park in Beijing, China, where student protesters calling for democracy were violently suppressed by Chinese government forces, had a significant impact on the Indiana University community. IU had more than 100 students studying abroad in China at the time, and the university worked to safely evacuate them amid the turmoil.