Casimir Pulaski, or Kazimierz Pułaski in Polish (Polish pronunciation: [kaʑiˈmʲɛʂ puˈwaski] ( listen); full name in Polish: Kazimierz Michał Wacław Wiktor Pułaski) of Ślepowron coat-of-arms (March 6, 1745^[1] – October 11, 1779), was a Polish soldier, nobleman, and politician who has been called "the father of American cavalry".^[2][3]

A member of the Polish landed nobility, Pulaski was a military commander for the Bar Confederation and fought against Russian domination of the Polish–Lithuanian Commonwealth. When this uprising failed, he emigrated to North America as a soldier of fortune. During the American Revolutionary War, he saved the life of George Washington^[4] and became a general in the Continental Army. He died of wounds suffered in the Battle of Savannah. Pulaski is one of only seven people to be awarded honorary United States citizenship.

The first Doctors Day observance was March 30, 1933 in Winder, Georgia.  Eudora Brown Almond, wife of Dr. Charles B. Almond, decided to set aside a day to honor physicians. This first observance included the mailing greeting cards and placing flowers on graves of deceased doctors. The red carnation is commonly used as the symbolic flower for National Doctors Day.

On March 30, 1958, a Resolution Commemorating Doctors Day was adopted by the United States House of Representatives. In 1990, legislation was introduced in the House and Senate to establish a national Doctors Day. Following overwhelming approval by the United States Senate and the House of Representatives, on October 30, 1990, President George Bush signed S.J. RES. #366 (which became Public Law 101-473) designating March 30, 1991 as "National Doctors Day."

Seward's Day is a legal holiday in the U.S. state of Alaska. It falls on the last Monday in March and commemorates the signing of the Alaska Purchase treaty on March 30, 1867.^[1] It is named for then-Secretary of State William H. Seward, who negotiated the purchase from Russia.

It should not be confused with Alaska Day, which marks the formal transfer of control over Alaska from Russia to the United States.

Cesar Chavez Day is an official state holiday in the U.S. states of California, Colorado and Texas. The day is commemorated to promote service to the community in honor of Cesar Chavez's life and work. Many, but not all, state government offices, community colleges, and libraries are closed. Many public schools in the state are also closed. Texas also recognizes the day, and it is an optional holiday in Arizona and Colorado. Although it is not a federal holiday, the President proclaims March 31 as Cesar Chavez Day in the United States, with Americans being urged to "observe this day with appropriate service, community, and educational programs to honor Cesar Chavez's enduring legacy."^[1] In addition, there are celebrations in his honor in Arizona, Michigan, Nebraska, and New Mexico and has been observed in California since 1995, in Texas since 2000 and in Colorado since 2003 as state holidays (optional in Texas and Colorado).^[2]

As a senator, Barack Obama made a call in 2008 for a national holiday in Chavez's honor, saying: "Chavez left a legacy as an educator, environmentalist, and a civil rights leader. And his cause lives on. As farm workers and laborers across America continue to struggle for fair treatment and fair wages, we find strength in what Cesar Chavez accomplished so many years ago. And we should honor him for what he's taught us about making America a stronger, more just, and more prosperous nation. That's why I support the call to make Cesar Chavez's birthday a national holiday. It's time to recognize the contributions of this American icon to the ongoing efforts to perfect our union." (Senator Barack Obama March 31, 2008)^[3] Grassroots organizations continue to advocate to create a national holiday. March 30, 2011, President Obama reiterated his support for the cause: "Cesar Chavez's legacy provides lessons from which all Americans can learn." ^[4]