Today in the history of the American comic strip: November 23

American cartoonists and writers may not have invented the comic strip, but some argue that the comics, as we know them today, are an American creation. Clearly, the United States has played an outsize role in the development of this underappreciated art form.

11.23.1974: The last daily installment of Paul Robinson’s long-running Etta Kett appears in print, followed by the final Sunday page the next day.

11.23.2003: Berkeley Breathed kicks off a new strip called Opus, a Sunday feature that runs until 2008. It is Breathed's fourth comic strip, following The Academia Waltz, Bloom County, and Outland.

11.23.2011: The Library of American Comics releases Definitive Flash Gordon & Jungle Jim, Vol. 1, which marks the launch of a series reprinting two Alex Raymond strips.
 

Most of the information listed here from one day to the next comes from two online sites -- Wikipedia, and Don Markstein's Toonopedia -- as well as 100 Years of American Newspaper Comics, edited by Maurice Horn. Note that my focus is on American newspaper comic strips (and the occasional foreign strip that gained popularity in the United States). Thus, comic books and exclusively online comics are not included here.