Hawaii was ranked the happiest state in the US.Alex Krassel/ShutterstockWalletHub released its ranking of the happiest states in the US.The study compared the 50 states across categories like community and environment.Hawaii was ranked the happiest state to live in.In March, the World Happiness Report ranked the US the 23rd-happiest country in the world — the first time it missed out on a top-20 spot since the report's inception in 2012.But how does happiness compare across state lines?