• Portland
  • Xi’an,Si’an,Chang’an

Portland (/ˈpɔːrtlənd/, PORT-lənd) is a port city in the Pacific Northwest and the largest city in the U.S. state of Oregon. Situated at the confluence of the Willamette and Columbia rivers, Portland is the county seat of Multnomah County, the most populous county in Oregon. As of 2020, Portland had a population of 652,503, making it the 26th-most populated city in the United States, the sixth-most populous on the West Coast, and the second-most populous in the Pacific Northwest, after Seattle. Approximately 2.5 million people live in the Portland metropolitan statistical area (MSA), making it the 25th most populous in the United States. About half of Oregon's population resides within the Portland metropolitan area.

Named after Portland, Maine, the Oregon settlement began to be populated in the 1840s, near the end of the Oregon Trail. Its water access provided convenient transportation of goods, and the timber industry was a major force in the city's early economy. At the turn of the 20th century, the city had a reputation as one of the most dangerous port cities in the world, a hub for organized crime and racketeering. After the city's economy experienced an industrial boom during World War II, its hard-edged reputation began to dissipate. Beginning in the 1960s, Portland became noted for its growing liberal and progressive political values, earning it a reputation as a bastion of counter-culture.

Xi'an, known as Chang'an and Jiajing in ancient times, is the capital of Shaanxi Province, the vice-provincial city, the core city of Guanzhong Plain urban agglomeration, the starting point of the Silk Road, the core area of "Belt and Road Initiative" and an important central city in western China. It is an important national scientific research, education and industrial base. The "historic city of the world" identified by the United Nations Educational, Scientific and Cultural Organization in 1981. Located in the middle of Guanzhong Plain, it is bordered by the Weihe River in the north, Qinling Mountains in the south and Chang'an in Bashui. Under its jurisdiction, 11 districts and 2 counties are in charge of Xixian New District, with a total area of 10752 square kilometers, with a resident population of 10.0037 million at the end of 2018 and a urbanization rate of 74.01%. The annual gross domestic product of the region is 834.986 billion yuan. Xi'an is one of the important birthplaces of Chinese civilization and the Chinese nation. In history, more than ten dynasties have established their capitals here.
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