See biography by D. J. Abodaher (1969).
Casimir Pulaski Day is a holiday observed in Illinois on the first Monday of every March to commemorate Casimir Pulaski, a Revolutionary War cavalry officer born March 4, 1747 in Poland as Kazimierz Pułaski. He is known for his contributions to the U.S. military in the American Revolution by training its soldiers and cavalry.
The day is celebrated mainly in areas that have large Polish populations. Chicago has the largest Polish population in the United States. This is a separate holiday from the federal holiday, General Pulaski Memorial Day, which commemorates Pulaski's death at the Siege of Savannah on October 11, 1779.
Illinois enacted a law on June 20, 1977 to celebrate the birthday of Casimir Pulaski and held the first official Pulaski Day celebrations in 1978. The bill was introduced by Senator Leroy W. Lemke, a Democrat from Chicago. Chicago celebrates Pulaski Day on the first Monday in March with an annual parade. Cook County government (which includes Chicago) and the Chicago Public Library also close on this holiday.
Michigan-born songwriter Sufjan Stevens titled a song "Casimir Pulaski Day" on his album Illinois. The song is not specifically about the celebration but about a personal event that took place on Casimir Pulaski Day as indicated by the lyric, "... in the morning, in the winter shade, on the first of March, on the holiday..."