"King was the chief spokesman for nonviolent activism in the civil rights movement, which successfully protested racial discrimination in federal and state law. The campaign for a federal holiday in King's honor began soon after his assassination in 1968. Ronald Reagan signed the holiday into law in 1983, and it was first observed in 1986. At first, some states resisted observing the holiday as such, giving it alternative names or combining it with other holidays. It was officially observed in all 50 states for the first time in 2000." - Martin Luther King, Jr. Day on Wikipedia
Related link: African-American Civil Rights Movement (1955–1968)
Martin Luther King, Jr. on War and Peace:
"We will never have peace in the world until men everywhere recognize that ends are not cut off from means, because the means represent the ideal in the making, and the end in process. Ultimately, you can't reach good ends through evil means, because the means represent the seed and the end represents the tree."
Martin Luther King, Jr on the Role of Religion in Society:
"A religion true to its nature must also be concerned about man's social conditions....Any religion that professes to be concerned with the souls of men and is not concerned with the slums that damn them, the economic conditions that strangle them, and the social conditions that cripple them is a dry-as-dust religion.
Such a religion is the kind the Marxists like to see---an opiate of the people."