The presidents of Chile and Mexico called for the strengthening of democracy in Latin America during a joint address on Sunday to commemorate the 50th anniversary of a 1973 coup in Chile, hours after a peaceful march culminated in violent clashes with police. Monday will mark half a century since the overthrow of President Salvador Allende by the regime of General Augusto Pinochet, which ushered in 17 years of brutal military rule that saw some 40,000 people imprisoned, disappeared, tortured or killed.