• Tucson
  • Panjin

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.

Panjin City is a prefecture-level city under the jurisdiction of Liaoning Province, located in the central and southern part of Liaoning Province, located in the center of the Liaohe Delta, is a city at the mouth of the Liaohe River; its geomorphology is high in the north and low in the south, gradually tilting from north to south; it is located in the north temperate zone and belongs to the warm temperate continental semi-humid monsoon climate; it has jurisdiction over one county and three districts; the city has a resident population of 1.439 million at the end of 2018, with a total area of 4102.9 square kilometers. Panjin is an important oil and petrochemical industry base in China and one of the important central cities in Liaoning coastal economic belt. Panjin is a "petrochemical new city", built on the edge of oil and flourished because of oil; the red beach scenic spot dominated by the Red Beach National Scenic Corridor is a national 4A-level scenic spot and an excellent tourist scenic spot in Liaoning Province. The ancient town Tianzhuangtai was the battlefield of the last battle of the Sino-Japanese land war between China and Japan, and became the education of patriotism.
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