Louisiana being part of the United States, the national holiday is July 4, Independence Day.
As to the big civil holiday in Louisiana, there isn't one at present. At one time, on paper, the big state holiday was supposed to be the Anniversary of the Battle of New Orleans, on January 8, but celebration of that holiday died out beginning after World War II, and by the time President's Day and Martin Luther King Day came along, Battle of New Orleans Day had more or less died of apathy.
Before about 1980, Mardi Gras was celebrated only in the southern parishes of Louisiana, from New Orleans to Lafayette and maybe Lake Charles, and in Mobile, Alabama, but not so far north as Baton Rouge. Since 1980, the celebration of Mardi Gras has expanded in all directions, certainly reaching Shreveport and Monroe (in Louisiana), but they are now celebrating Mardi Gras in Denver an Salt Lake City.
The mind boggles.
''what is chile's national holiday?''
It never was because it's not a national holiday. Christmas is the only national holiday celebrated.
There are no nations in Antarctica, meaning that there is no 'national holiday'.
Mardi Gras
Louisiana
The national holiday was called GandhiJayanti.
Thanksgiving Day is not a national holiday in England.
Yes, it is a national holiday in the United Kingdom
Cinco de Mayo is a national holiday in Mexico. Though it is not a national holiday in the United States. it is widely celebrated.
No, it is not a national holiday in ANY country except Israel.
Yes. In England it's a national holiday for everyone.
Yes Christmas is national holiday and it is in any other religion