• Tucson
  • Daiyue 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.

Daiyue District, located in Taian City, Shandong Province, is located in the hinterland of Qilu, Jinan, the provincial capital, Qufu, the hometown of Confucius, between latitude 35 °52 "29"-36 °28 "36" and longitude 116 °50 "26"-117 °28 "16" east. It is 66 kilometers from north to south and 56 kilometers from east to west, with a total area of 917.2 square kilometers. The overall topography of Daiyue District is high in the north and low in the south, high in the east and low in the west, with mountains, hills and plains accounting for 1/3 each, which belongs to the temperate continental semi-humid monsoon climate. It is the birthplace of the ancient civilization "Dawenkou culture". In the Spring and Autumn and warring States period, it has the reputation of "plucking the land since ancient civilization, Qilu must compete for Wenyang field". During the Western Han Dynasty, Liu an, king of Huainan, left here the chant of "the beauty of the central government, there is Daiyue".
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