Sunshine Is the ...People in sunny, outdoorsy states — Louisiana, Hawaii, Florida — say they're the happiest Americans, and researchers think they know why. The happiness ratings were based on a survey of 1.3 million people across the country by the Centers for Disease Control and Prevention. It used data collected over four years that included a question asking people how satisfied they are with their lives. Economists Andrew J. Oswald of the University of Warwick in England and Stephen Wu of Hamilton College in Clinton, N.Y., compared the happiness ranking with studies that rated states on a variety of criteria ranging from availability of public land to commuting time to local taxes. Probably not surprisingly, their report in Science magazine found the happiest people tend to live in the states that do well in quality-of-life studies.