WASHINGTON, United States (AFP) — US President Joe Biden has urged Americans to show unity, “our greatest strength,” in a video posted Friday, on the eve of the 20th anniversary of 9/11. “To me, that’s the central lesson of September 11th. It’s that at our most vulnerable, in the push and pull of all that makes us human, in the battle for the soul of America, unity is our greatest strength,” Biden says in […]