• Tucson
  • Qitaihe

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.

Qitaihe City, a prefecture-level city in Heilongjiang Province, is located in the eastern part of Heilongjiang Province, south of Jiamusi City, at the western end of Wanda Mountain Mountains, belonging to low mountains and hills, high in the southeast and low in the northwest, located in the middle latitude, with a cold temperate climate and continental monsoon climate; the city has a total area of 6221 square kilometers and has jurisdiction over 3 districts and 1 county; the registered population is 777100 in 2018. Qitaihe is located in the center of the urban agglomeration in the east of Heilongjiang Province. Mujia High Speed Railway, Mu Jia Railway, Heda Expressway, Yiqi Expressway and Raogai Highway run through the whole territory, connecting with provincial capital and surrounding cities and counties, and forming a regional strategic cooperation city with 14 cities (states) in the eastern part of Northeast China. Qitaihe area is one of the birthplaces of the Sushen nationality; it was once the headquarters of the Jidong Provincial Party Committee and the second Route Army of the Anti-Japanese Union. Seven sets
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