On this day... December 1:

On this day...

December 1: World AIDS Day; Great Union Day in Romania (1918) 1828 – Juan Lavalle (pictured), returning to Buenos Aires with troops that fought in the Cisplatine War,deposed the provincial governor Manuel Dorrego, reigniting the Argentine Civil Wars. 1913 – Ford Motor Company began operating the world's first moving assembly line for the mass production of automobiles. 1941 – The Civil Air Patrol, the civilian auxiliary of the United States Air Force, was founded. 1959 – Twelve countries signed the Antarctic Treaty, the firstarms control agreement established during the Cold War, banningmilitary activity in the Antarctic and setting the continent aside as a scientific preserve. 1990 – Channel Tunnel workers from the United Kingdom and France met 40 metres (131 ft) beneath the English Channelseabed.