The poll will mark the end of the 38-year rule of President Jose Eduardo dos Santos who is not running for reelection.
One year ago in Burundi, journalist Jean Bigirimana disappeared without a trace.
There is little doubt that Rwanda's President Paul Kagame will win the elections on August 4, as his government leaves no room for opposition.
June 12 is the World Day Against Child Labour. The UN estimates that 168 million children are being put to work globally.