 Giggles and screams of joy come easy for children, but as time goes on, that joy is harder to come by. The Gallup World Poll measures global happiness every year and develops a world happiness ranking. What they found? We aren't as happy as we used to be. Americans 30 and under have shown decreases in their happiness over the past eight years. As a country, the United States recently dropped from 15 to 23rd place in our global happiness ranking. Tracy Holden teaches a happiness course at the University of Delaware.