1. In 1882, Iowa Farmer's Alliance was established in Des Moines. This organization aimed to fight against the unfair practices of big businesses and promote the rights of farmers.

2. On May 6, 1937, the Hindenburg disaster occurred in New Jersey. Although Iowa was not directly involved, many Iowans were among the reporters, photographers, and rescue workers who rushed to the scene.

3. In 1954, the United States Supreme Court issued its landmark Brown v. Board of Education decision, which declared segregation in public schools to be unconstitutional. This ruling had a significant impact on Iowa, which had already taken steps to desegregate its schools in the years leading up to the decision.

4. May 6, 1971, marked the first flight of the prototype of the Rockwell B-1 Lancer bomber, which was designed and built in Cedar Rapids, Iowa.

5. On May 6, 2006, Iowa State University held its first annual Veishea Arts and Music Festival, which aimed to showcase the talents of local artists and musicians. The festival became a popular tradition on campus until it was discontinued in 2014 due to a series of violent incidents during the event.