The language, history, and basic customs are not enough. The chief rivers are the Mississippi, the longest river in the world (flows into the Gulf of Mexico), the Colorado and the Columbia, which flow into the Pacific Ocean, and the Hudson River, which flows into the Atlantic Ocean. Not to do so is impolite. D. Tactlessness. Health Claim for Retail Therapy Retail therapy is a more accurate description of shopping than previously thought according to new research which shows it really does have health benefits.