Here are five interesting facts about May 1 in Illinois history:

1. In 1886, the Haymarket Riot in Chicago occurred on May 1. The labor protest turned violent when a bomb was thrown at police, resulting in several deaths and injuries. This event had a significant impact on the labor movement and the establishment of May 1 as International Workers' Day.

2. May 1, 1931, marked the opening day of the 1933 Century of Progress World's Fair in Chicago. The event showcased new inventions and advancements in science and technology, and attracted over 48 million visitors during its two-year run.

3. May 1, 1960, saw the inauguration of the United States' first major interstate highway, the Illinois Tollway. Spanning over 2,000 miles, the tollway system connected the state of Illinois to neighboring cities and states, fueling economic growth and travel convenience.

4. On May Day 1970, a group of anti-Vietnam War protesters staged a rally at the University of Illinois in Champaign-Urbana. The demonstration escalated into a riot, with police using tear gas and making several arrests.

5. On May 1, 2006, Illinoisans joined nationwide protests against proposed federal immigration laws. The day saw large-scale walkouts and rallies, with immigrants and their advocates advocating for immigrant rights and protesting harsh enforcement measures.