Will Obama change US policy towards Africa?

US President Barack Obama has said Africa must take charge of its own destiny in the world. Do you agree?

President Obama, on his first official visit to sub-Saharan Africa, has made a powerful call for Africans to stand up for their democratic rights.

He said Africa could have a prosperous future and promised American aid to fight the continent's diseases, conflicts and lack of development.

Is this a defining moment for the continent? Has President Obama lived up to expectations? And what does this speech say about Africa's place in the world?