I always thought of Superman as Mexican-American. When I was in high school, there was a Mexican-American girl there named Bonnie Kent. Note that Superman’s alter ego is Clark Kent.
Comic book fans have always known that geeky, picked-on Jewish kids invented Superman as an emotional outlet. Like the dream of many Jews, Superman is the ultimate outsider who becomes the ultimate American.
Superman appears to have ‘inspired’ heavily by the pulp character ‘Doc Savage’: ‘Man of Bronze’ led to ‘Man of Steel’; Clark Savage became Clark Kent, and Doc had his ‘Fortress of Solitude’ LONG before the other guy.