Why Was 'ER' Canceled After 15 Seasons?

Hailed as one of the finest television shows of all time and a pioneer of the medical drama genre, ERfamously ran for 15 seasons from 1994 to 2009 and featured a slew of famous faces over the course of its tenure. From Hollywood leading men like George Clooney and Mekhi Phifer to TV staples including Noah Wyle, John Stamos, and Julianna Marguilies, ER helped launch the careers of its talented ensemble cast and took the world by storm.
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