Congress authorized U.S. commemorative coins for which event held in 1984, 1992 and 1996?

In October 1967, Fidel Castro confirmed that it was "sadly true" that which revolutionary had been killed in Bolivia? Which capital of the Democratic Republic of the Congo was founded by explorer Henry Morton Stanley? Which document did Congress adopt in 1777, though it was not ratified by all the states until 1781? Who was the U.S. president when Congress declared war on Britain in 1812? Congress created which Cabinet department in 1965, though its first secretary wasn't appointed until 1966? Congress established which national park in Arizona on February 26, 1919? Which U.S. president, paralyzed from the waist down by polio, died in office in April 1945? Congress passed laws named for which crime, defined as inciting rebellion against the government, in both 1798 and 1918?