Final answer:
Jackson Pollock is the American artist known for his use of action painting.
Step-by-step explanation:
Jackson Pollock is the American artist known for his use of action painting after World War II. Action painting, also known as gestural abstraction, involves the artist applying paint rapidly and energetically to the canvas, often using unconventional methods such as dripping or pouring the paint. Pollock's style of action painting became an important movement within the abstract expressionist movement.
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