Casimir Pulaski was a talented military leader and brilliant battlefield tactician who, in the 1770s, had to leave his native Poland after participating in the unsuccessful wars to oust Stanisław II, a king put in place to rule at the behest of the Russians. While in exile in Paris, Pulaski met and befriended Ben Franklin, who recruited him for the American Revolution's cause.Sadly, as the years passed and and Polish influence in Chicago waned, Pulaski Day became less celebrated. Today, schools and government offices no longer close. However, one notable Chicago resident still pays homage to Casimir Pulaski.
After initial resistance from Colonists reluctant to place a foreigner in an important military post, Pulaski, serving informally, proved his mettle at Brandywine and Germantown. George Washington was so impressed that he made Pulaski a Brigadier General and the first Commander of the American Cavalry. Soon after this recognition, in 1779, Pulaski died from wounds sustained at the Siege of Savannah.
Flash-forward a century or so to Chicago, which, by the late 1800s, had become a worldwide capital for Polish emigration. In the 1930s, Polish citizens in the city, who had faced discrimination, had taken to championing Casimir Pulaski as an example of a great Polish-American hero in the name of cultural integration and understanding. Tributes to the general sprouted up around town—most notably the renaming of a major thoroughfare "Pulaski Road."
Pulaski's profile in Chicago grew, and in 1977, the Polish American Congress successfully lobbied for a law in Illinois designating the first Monday of March as “Casimir Pulaski Day.” At first, it was merely a commemorative holiday, meaning schools and other institutions stayed open, but in 1985, Pulaski Day became a full public holiday for schools. Depending on where you were in the state, other government offices and some banks would also choose to close on that Monday.
... in 2009, former Chicago resident Barack Obama signed a joint resolution of the House and the Senate to make Casimir Pulaski an honorary United States citizen.It's the only worthwhile thing he's done during his time in office.
For more detailed information on the rise and fall of Pulaski Day go here.