On March 3rd:

 1845  Florida Becomes the 27th State of the United States

On March 3rd, 1845, Florida becomes the 27th state of the United States, after being a territory for more than two hundred years. Its admission marked a significant expansion of the country’s southeastern region.

 1931  The United States Establishes The “Star-Spangled Banner” as the Official National Anthem

“The Star-Spangled Banner” becomes the official national anthem of the United States. This decision came after a long history of the song being associated with American patriotism and national identity.

1991  LAPD Officers Beat Rodney King on Camera

On March 3rd, 1991, Rodney King is severely beaten by Los Angeles police officers, leading to widespread riots in Los Angeles in 1992 after the officers involved are acquitted. The event sparked national debate about race relations and police brutality in the United States.