Mo. Rev. Stat. § 9.163: Rosa Parks Day to be proclaimed annually on February 4.

The governor shall issue annually a proclamation setting apart the fourth day of February as "Rosa Parks Day" and recommending to the people of the state that the day be appropriately observed in honor of and out of respect for Rosa Parks, an African-American woman who refused to give up her bus seat to a white man, an act of defiance that opened a decisive chapter in the civil rights movement in the United States.