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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.

Mangshi, known as "Chuan Huan" in Dai language, is the capital of Dehong Dai Jingpo Autonomous Prefecture, Yunnan Province, people's Republic of China. It is located between 98 °05 Longitude 98 °44km east longitude and 24 °05km north latitude, about 71 km from east to west and 62 km from north to south, with a total area of 2987 square kilometers. Longling County is bordered by Longling County in the east and northeast, Ruili City in the southwest, Lianghe County and Longchuan County in the west and northwest across the Longchuan River, and the Republic of the Union of Myanmar in the south. It is the transportation hub leading to Ruili, Longchuan, Yingjiang and Lianghe, and it is also an important gateway for China to South and Southeast Asia. In ancient times, Mangshi was the territory of the Dai nationality, which is inhabited by the Dai, Han, Jingpo, Deang, Achang, Lisu and other ethnic groups, with a total population of 3949.
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