I have put together three of the most important speeches from the 20th century.
The first, and unarguably, most famous speech is "I Have A Dream" delivered by Martin Luther King Jnr on August 28, 1963, in which he called for an end to racism in the United States. The speech, delivered to over 200,000 civil rights supporters from the steps of the Lincoln Memorial during the 'March on Washington for Jobs and Freedom', was a defining moment of the American Civil Rights Movement.
Wikipedia entry here - http://en.wikipedia.org/wiki/I_Have_a_Dream
The second is the prophetic last speech given by Martin Luther King Jnr, commonly referred to as his "I Have Been To The Mountain Top" speech, and was delivered the day before he was assassinated.
The final speech in this Boo is the speech given by the then American President Robert F. Kennedy announcing to America the death of Martin Luther King Jnr.
You can access all the speeches in this Boo via my Dropbox link here - http://db.tt/P1T9IJcd
It contains MP3 files of this Boo and the individual speeches!