A 1921 treaty dividing an island, with an oath of fidelity to the Crown, led to civil war in which country?

A 1920s hit by Sammy Fain and Irving Kahal said to "Let a" what "be your umbrella"? Watching fish freeze solid in Labrador inspired Clarence Birdseye's method of preserving food by what? 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 1924 law granted U.S. citizenship to which people, whose tribes were once called "domestic dependent nations"? A 1924 campaign poster for which president featured an electric fan and the slogan "Keep Cool"? Which title is shared by a 1925 dinosaur film based on Conan Doyle and a 1997 dinosaur film based on Michael Crichton? Which 1925 Sergei Eisenstein film, named for a Russian warship, commemorated the 1905 revolution?