A look back at the presidency of Barack Obama. Above: The silhouette of US President Barack Obama is seen as he reviews the honour guard during the welcoming ceremony at Planalto Palace in Brasilia, on March 19, 2011.
A look back at the presidency of Barack Obama. Above: The silhouette of US President Barack Obama is seen as he reviews the honour guard during the welcoming ceremony at Planalto Palace in Brasilia, on March 19, 2011.