Kansas City is one metropolitan area comprising two separate cities: Kansas City, Missouri and Kansas City, Kansas, straddling the Missouri River.
Founded independently in the 1830s: Kansas City, MO (1838) named after the Kansas River; Kansas City, KS (1850) originally Wyandotte, renamed in 1886 to avoid confusion with another Wyandotte in Kansas.
Though distinct—KCMO larger (~450K), KCK smaller (~150K), different political leans—they share resources, amenities, sports teams (Chiefs, Royals), and cultural institutions (Nelson‑Atkins Museum, Kauffman Center). Their close relationship benefits both.