From 1915 the US made tons of loans to the UK to help them in their war effort. It is not a stretch to say that WWI was the major factor in contributing to the "Roaring 20s" when the US economy boomed. ... The long term effect was that US involvement in the war lead directly to the Great Depression and WWII.
Reductionism-the practice of analyzing and describing a complex phenomenon in terms of phenomena that are held to represent a simpler or more fundamental level, especially when this is said to provide a sufficient explanation.
