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  • Lankao County

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.

Lankao, a county under the jurisdiction of Kaifeng City, Henan Province, and Zhiguan County, Henan Province, is located at the last bend of the Jiuqu Yellow River, with a total area of 1116 square kilometers and a total population of 859100. It is an important part of "half-hour traffic circle" in "one pole, two circles and three layers" in Henan Province. Lankao County was a household in the Spring and Autumn period, and Jiyang County was the beginning of Lankao County in the Qin Dynasty. In 5 BC, Emperor Liu Xiu, Emperor of the Han Dynasty, was born in the Jiyang Palace in the north of the county. In 9 years, it was changed from Dongfen County to Dongming County. In 1218, Dongming County was abandoned as Tongan Castle, and the new county seat was moved to the old land of Yuanggu County in the north of the Yellow River. In 1232, the south of the Yellow River was divided into two counties: Lanyang County and Yifeng County. In March 1783, the county seat of Kaocheng County moved to Lankao County for the first time. In 1825, Yifeng County was merged into Lanyang County, known as "Lanyi County".
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