• Tucson
  • Luohe

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.

Luohe City, a municipality of Henan Province, is located on the southwest edge of the North China Plain. Funiu Mountain in the west and plain in the east is the joint of the second and third steps on the Chinese terrain; it is located on the southern edge of the warm temperate zone and belongs to the warm transitional monsoon climate. In the course of the year, there is an alternation of hot and cold and four distinct seasons. It has jurisdiction over 3 municipal districts and 2 counties with a total population of 2.8413 million in 2018. Luohe has a long history. The seven-tone bone flute, the national treasure unearthed at the Jiahu site, is the earliest musical instrument in the world; the oracle bone inscription symbol found 8000-9,000 years ago is the earliest written prototype in the world so far; the wine-making relics unearthed push the history of human wine-making to more than 9000 years ago; Xu Shen, who compiled the world's earliest dictionary Shuo Wen Jie Zi, also lived in this land. November 2018, enter
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