American realism emerged around the turn of the 20th century as painters turned from polished academic subjects to the world in front of them: tenements, barrooms, snow-shoveled streets, prize fights, and small-town rituals. Its core was the Ashcan circle - Robert Henri and his students John Sloan, George Bellows, William Glackens, Everett Shinn, and George Luks, most of them newspaper illustrators first - who painted New York's working city at speed. Thomas Eakins and Winslow Homer had already shown the way with unsentimental observation, and Edward Hopper carried the realist gaze into the mid-century, stripping it to bare light and silence. The movement prized directness over finish: dark grounds, quick strokes, and subjects the academy considered unworthy of paint.
Lead image of the Wikipedia article "American realism".Public domain (credit: George Bellows) · source
Defining characteristics
Everyday subjects treated seriously: tenements, bars, streets, work, sport
Loose, quick brushwork over dark grounds, favoring freshness above finish
Candid, cropped compositions - scenes caught in motion, like snapshots
Social observation without idealization: poverty, crowds, vice, labor