In what year was 'It's a Wonderful Life' released?

Who directed 'Casablanca' (1942)? Who directed 'The Wizard of Oz' (1939)? Who directed 'Gone with the Wind' (1939)? Who directed 'It's a Wonderful Life' (1946)? Who directed 'Sunset Boulevard' (1950)? In what year was 'Sunset Boulevard' released? Who directed 'Some Like It Hot' (1959)? In what year was 'Some Like It Hot' released?