Americans fought in the Abraham Lincoln Battalion in which 1936-39 conflict?

Which Beat poet wrote "Howl"? "American Prometheus" is a biography of which physicist, who died in 1967? American Turf Monthly has covered which sport since 1946? Which first lady won Americans' hearts with a televised tour of the White House on February 14, 1962? Americans lost which June 17, 1775, battle at Charlestown, Massachusetts, after running out of ammunition? Americans often call Emmentaler by what name? Which British expression for "the whole enchilada" was the title of a 1997 Best Picture nominee? Americans thought the Korean War would end by Christmas 1950, until which country joined the fight?