• Tucson
  • Boshan 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.

Boshan District, which belongs to Zibo City, Shandong Province, is located in the middle of Shandong Province, in the north of Shandong Province, in the south of Zibo City, bordering Yiyuan County in the south, Laiwu City in the southwest, Zhangqiu City in the northwest, Zichuan District in the east and north, between longitude 117o43km east, latitude 36 °16km, north latitude 36 °16km, north-south 49.4km long, east-west width 20km, total area 698.2 square km. The scenic spots in Boshan District are part of the World Cultural Heritage Great Wall, such as Qi Great Wall, Yan Wenjiang Temple, Bixia Yuanjun Palace, Yuhuang Palace, Fan ancestral Hall, Fenghuang Mountain and so on. Boshan District has honorary titles such as "hometown of Chinese Ceramic Glass Art", "famous City of Chinese pump Industry", "hometown of Chinese Glass", "famous City of Chinese Shandong cuisine" and so on.
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