Watching fish freeze solid in Labrador inspired Clarence Birdseye's method of preserving food by what?

Which name is shared by a 1920s dance and a city in South Carolina? Which Verdi opera, set in ancient Egypt, premiered in Cairo in 1871? Which 1927 Jerome Kern musical follows performers on a Mississippi River boat? A 1920s hit by Sammy Fain and Irving Kahal said to "Let a" what "be your umbrella"? The question "Will it play in ___?", about which Illinois city, became a test of mainstream American appeal? A 1921 poem by Vachel Lindsay was "In Praise of" which wandering planter? A 1921 treaty dividing an island, with an oath of fidelity to the Crown, led to civil war in which country? A 1924 law granted U.S. citizenship to which people, whose tribes were once called "domestic dependent nations"?