What is the main idea of this? Please help-I'm terrible in english-

Question

Five score years ago, a great American, in whose symbolic shadow we stand today, signed the Emancipation Proclamation. This momentous decree came as a great beacon light of hope to millions of Negro slaves who had been seared into the flames of withering injustice. It came as a joyous daybreak to end the long night of captivity. But one hundred years later, the Negro is still not free. One hundred years later, the life of the Negro is still sadly crippled by the manacles of segregation and the chains of indiscrimination. One hundred years later, the Negro lives on a lonely island of poverty in the midst of a vast ocean of material prosperity. One hundred years later, the Negro is still languished in the corners of American society and finds himself an exile in his own land. And so we've come here today to dramatize a shameful condition."

Answer 1

I'm sorry-I needed to know what the theme was
Thank you

Answer 2

This is the beginning of Martin Luther King, Jr's "I have a dream" speech. You will find the text as well as audio and video (scroll way down) of this speech here:
http://www.mlkonline.net/dream.html

Let us know what YOU THINK the theme is.