Plunge! Rebound! Crash! Rally! Plunge again! Why is the U.S. stock market so volatile?
3. Europe Uncertainty -- A looming euro zone debt crisis weighed on markets for years, and the worst may not yet be over.
iStock / LawrenceSawyer
Library of Congress
Wisconsin Dept. of Natural Resources
Enrique Castro-Mendivil / Reuters
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Larry Downing / Reuters
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