• Tucson
  • Jian'an District

Tucson (/ˈtuːsɒn, tuːˈsɒn/; Spanish: Tucson, O'odham: Cuk-Ṣon) is a city in and the county seat of Pima County, Arizona, United States, and is home to the University of Arizona. It is the second largest city in Arizona behind Phoenix, with a population of 542,629 in the 2020 United States census, while the population of the entire Tucson metropolitan statistical area (MSA) is 1,043,433. The Tucson MSA forms part of the larger Tucson-Nogales combined statistical area (CSA). Both Tucson and Phoenix anchor the Arizona Sun Corridor. The city is 108 miles (174 km) southeast of Phoenix and 60 mi (97 km) north of the U.S.–Mexico border. Tucson is the 34th largest city and the 53rd largest metropolitan area in the United States (2014).

Major incorporated suburbs of Tucson include Oro Valley and Marana northwest of the city, Sahuarita south of the city, and South Tucson in an enclave south of downtown. Communities in the vicinity of Tucson (some within or overlapping the city limits) include Casas Adobes, Catalina Foothills, Flowing Wells, Midvale Park, Tanque Verde, Tortolita, and Vail. Towns outside the Tucson metro area include Benson to the southeast, Catalina and Oracle to the north, and Green Valley to the south.

Tucson was founded as a military fort by the Spanish when Hugo O'Conor authorized the construction of Presidio San Agustín del Tucsón in 1775. It was included in the state of Sonora after Mexico gained independence from the Spanish Empire in 1821. In 1853, the United States acquired a 29,670 square miles (76,840 km2) region of present-day southern Arizona and southwestern New Mexico from Mexico under the Gadsden Purchase. Tucson served as the capital of the Arizona Territory from 1867 to 1877. Tucson was Arizona's largest city by population during the territorial period and early statehood, until it was surpassed by Phoenix by 1920. Nevertheless, population growth remained strong during the late 20th century. In 2017, Tucson was the first American city to be designated a "City of Gastronomy" by UNESCO.

Jian'an District is the municipal district of Xuchang City, Henan Province, which is located in the middle of Xuchang City, Henan Province, surrounded by Weidu District of Xuchang City, Mianling County to the east, Yuzhou City to the west, Linying County to the south and Changge City to the north. The geographical coordinates are 113 °35 °east longitude 114 °04 'and 33 °52 °34 °10' north latitude. Jian'an District has a total area of 1090 square kilometers. in 2015, the total output value of Jian'an District was 24.306 billion yuan, an increase of 9.6% over the same period in 2015. In 2017, Jian'an District has jurisdiction over 16 township offices with a total population of 1.3076 million. Jian'an District is the national advanced area of scientific and technological progress, the first batch of key areas of opening up to the outside world, the advanced area of developing export-oriented economy, the national important processing and export base of hair products, and the production base of automobile transmission shaft. Jian'an District was selected in 2018.
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