President Trump publicly dressed down the president of South Africa based on a fringe conspiracy theory, providing a vivid distillation of his views on race.

© Eric Lee/The New York Times

President Trump showed a video and leafed through printouts that he falsely claimed showed widespread persecution of white South Africans. The country’s president tried to correct the record.

© Eric Lee/The New York Times

President Cyril Ramaphosa pushed back on Mr. Trump’s allegations.

© Eric Lee/The New York Times

A journey to the Smithsonian’s National Museum of African American History and Culture took me places I will not soon forget.