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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.

Wudi County, which belongs to Binzhou City, Shandong Province, is located in the northernmost part of Shandong Province, located on the coast, bordering Bohai Bay in the northeast, Zhanghua District in the southeast, Yangxin County in the south, Qingyun County in Dezhou City in the west, and Haixing County and Huanghua City in Hebei Province by Zhangwei River in the north. It is located between 37 °4 degrees north latitude and 38 degrees 16 miles north latitude and 118o 04 degrees east longitude, with a total area of 1961 square kilometers. Wudi County is the intersection of the two major economic zones of Beijing, Tianjin and Shandong Peninsula, known as "Hebei-Shandong hub" and "Qiyan fortress". It is not only the key area for the comprehensive development of the Yellow River Delta, but also the forward position for the construction of "Shandong at Sea". In 2018, Wudi County has jurisdiction over 2 streets and 10 towns with a total registered population of 456100, achieving regional gross domestic product (GDP).
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