It’s July 9. The firecrackers aren’t snapping and the flags aren’t flapping. What remains for me is the memory of James Cagney as George M. Cohan in “Yankee Doodle Dandy.” I can’t stop humming “It’s a Grand Old Flag,” “Over There” or “I’m a Yankee Doodle Dandy.” And I can’t forget the sight of that powerful little man going into one of his tap-dancing riffs. He is the essence of jaunty, of sticking out one’s chin and plunging into life. Was our country ever that innocent and optimistic? I replay the final scene of that movie, Cagney dancing down the steps of the White House after telling his life story to President Roosevelt, and I think yes, maybe it was.