In "I have a dream", What does mean by a beautiful symphony of brotherhood

The moment to bridge the chasms that divide us has come" Why do the word bridge the chasms have been used ---

And when this happens, and when we allow freedom ring, when we let it ring from every village and every hamlet ____ will be able to join hands and sing in the words of the old Negro spiritual, "Free at last! In this statement what does the word hamlet refer to  __

William Wordsworth considered poets dreamers; because they have the ability to turn “our wish, our power, our thought" into "a deed." What does the word 'deed' mean? 

Which of the following is not true about Martine Luther King?