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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.

Ningxia Hui Autonomous region, referred to as Ning, is one of China's five autonomous regions, the capital of Yinchuan. It is located in the inland area of northwest China, bounded by latitude 35 °14 & # 39 in north latitude and longitude 104o 17 & # 39 in east longitude, bordering Shaanxi in the east, Inner Mongolia in the west and Inner Mongolia in the north and Gansu in the south. Ningxia Hui Autonomous region has a total area of 66400 square kilometers. The topography of Ningxia is gradually inclined from southwest to northeast, with numerous hills and gullies. The topography is divided into three major plates: the Yellow River diversion irrigation area in the north, the arid zone in the middle and the mountain area in the south. Ningxia is located in the Yellow River system, the terrain is high in the south and low in the north, showing a ladder-like decline, the whole region belongs to temperate continental arid and semi-arid climate. By the end of 2018, Ningxia Hui Autonomous region had jurisdiction over 5 prefecture-level cities, 9 municipal districts,
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