Sometimes we can fall into the deepest despair. There aren’t many reasons to believe in the Mankind. Nevertheless History wakes us up and reminds us how some people have worked and fought to give us a more comfortable and peaceful world. Two of the most important people were Martin Luther King and Nelson Mandela. Both of them worked very hard to achieve the harmony between black and white peoples in their countries.
You have to see and listen to the next speeches of these men.
You can read the speech of Nelson Mandela in this link