Easter Rising: Irish rebels, led by Patrick Pearse and James Connolly, launch an uprising in Dublin against British rule and proclaim an Irish Republic.
Civil war breaks out in the Dominican Republic when Colonel Francisco Caamaño, overthrows the triumvirate that had been in power since the coup d'état against Juan Bosch.
Vietnam War: American General William Westmoreland says in a news conference that the enemy had "gained support in the United States that gives him hope that he can win politically that which he cannot win militarily."