Electronics, mining, defense, and technological research and development have been some of the leading creators of private-sector jobs in Arizona. Tourism is also an important source of Arizona jobs, thanks to the state’s warm, dry climate and natural attractions such as the Grand Canyon. Many high-tech and telecommunications companies operate in Phoenix, AZ, the state’s capital and largest city. Manufacturing, tourism, and banking and finance are important sources of jobs in Phoenix, Arizona. The city’s population boom (it is the fifth most populous city in the U.S.) has spurred growth in the construction and service industries as well. Elsewhere in the state, high-tech industries have been such an important factor in the creation of Tucson jobs that the region has been given the nickname Optics Valley. Healthcare and aeronautics companies are also important to the Tucson economy. Industries as diverse as aviation and golf are the source of high-tech jobs in Mesa, Arizona, the most populous suburban city in the U.S.