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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.

Lishu County, which belongs to Siping City, Jilin Province, is located in the southwest of Jilin Province, located in the hinterland of Songliao Plain, bounded by Liaohe River to the east of Gongzhuling City in the east, Shuangliao City in the north, Changtu County in Liaoning Province in the west and Siping City in the south. It is between 123 °45 degrees east longitude 124 °53 kilometers east longitude and 43 °02 degrees north latitude, 43 °46 degrees north latitude. The total area is 4209 square kilometers. The terrain is high in the southeast and low in the northwest. Low mountains and hills in the south, wavy plains in the middle, and East Liaohe alluvial plain in the north. Lishu established a county in the fourth year of Guang Xu of the Qing Dynasty (1878), formerly known as "Fenghua County". It was once the birthplace of the Qing Emperor Nuerhachi "Fujin", the birthplace of Empress Dowager Xiaocigao, the birth mother of Empress Taiji and the ancestral place of the Empress Dowager Cixi. Lishu County has the reputation of "Northeast granary" and "Songliao Pearl". As of 201
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