• Tucson
  • Zhangdian 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.

Zhangdian District, Zibo Municipal District, Shandong Province, is located in the middle of Zibo City; the terrain slows down gradually from south to north, and belongs to the warm temperate monsoon semi-dry and semi-humid continental climate zone; it has jurisdiction over 6 towns and 7 streets, with a total area of 244 square kilometers; the total population in 2017 is 687121. Zhangdian District is the transportation and communication hub in central Shandong and one of the important node cities in Jinan metropolitan area. It is 70 kilometers away from Jinan International Airport, 210 kilometers away from Qingdao Port and 380 kilometers away from Yantai Port. Jiaoqing Expressway and Binlai Expressway meet here. Jiaoji Railway and 309 National Highway run from east to west, National Highway 205 runs from north to south, and 16 trunk highways lead to the whole country. After the completion of the north line of the Ji-Qing high-speed railway, it will reach Jinan in 20 minutes, Qingdao in 1 hour and Beijing in 2 hours. 2017
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