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Pine Bluff is the county seat of Jefferson County in southeast Arkansas and the state's tenth-most populous city with 41,253 residents at the 2020 census. Located in the Arkansas Delta and straddling the Arkansas Timberlands, the city features flat topography with farmland and is traversed by Bayou Bartholomew, the world's longest bayou and second most ecologically diverse stream in the United States, along with the Arkansas River and multiple lakes. Founded officially on October 16, 1832, by Joseph Bonne - a government interpreter of Quapaw, French, and Plains Apache descent who relocated after the 1819 flood - Pine Bluff became a major steamboat port and inland shipping center connecting to New Orleans and serving as a Trail of Tears station from 1832 to 1858. The city's antebellum prosperity was built on cotton cultivation and enslaved labor, making Jefferson County second in state cotton production by 1860, until Federal occupation began in September 1863 during the Civil War. Pine Bluff's economy and strategic importance were historically centered on its Arkansas River location, which enabled its development as a critical transportation and trading hub in the Delta region. Jonesboro is the fifth-most populous city in Arkansas, located on Crowley's Ridge in the northeastern part of the state with a 2020 census population of 78,579 and an estimated 2026 population of 84,155. Established as a permanent settlement shortly after 1859 when Craighead County was formed, it was named after State Senator William A. Jones in recognition of his support for the county's creation and originally spelled Jonesborough before being shortened to its current spelling. Home to Arkansas State University, Jonesboro serves as the cultural and economic center of Northeast Arkansas, with its 2024 metropolitan area population reaching 138,152. The city's early history includes the tragic Jonesboro Lynching of March 12, 1881, when between 200 and 300 masked men hanged four Black men accused of murder, an event the Decatur Daily Republican called "one of the blackest pages in the annals of the state." During the late 19th century, Jonesboro developed its infrastructure despite early setbacks, including the destruction of its first courthouse by fire in 1869 and a second courthouse building by fire in 1876. El Dorado is the county seat of Union County on Arkansas's southern border, with a 2020 population of 17,755 that has an African American majority. Founded by Matthew Rainey in 1843, the city became Arkansas's "Original Boomtown" following the 1921 completion of the Busey No. 1 oil well, which launched a major 1920s oil boom and led to the 1922 commissioning of the El Dorado Oil Refinery. The city serves as the cultural and business center of south central Arkansas, hosting the Murphy Arts District, South Arkansas College, and the South Arkansas Arts Center, while functioning as headquarters for the Arkansas Oil and Gas Commission, Murphy USA, Deltic Timber Corporation, and a Delek US oil refinery. Located in the West Gulf Coastal Plain with a humid subtropical climate, El Dorado's economy historically centered on oil, chemical production during World War II, and timber, industries that remain significant today. The city's notable history includes the organization of its first Presbyterian church in 1843 and the arrival of its first passenger train from Camden in 1891.