0 What decade of the 20th century is often described as "roaring"? 1920s 1930s 1940s 1950s Play Now More questions Which U.S. president announced the Truman Doctrine in 1947? Play Now Which physicist proposed the uncertainty principle in 1927? Play Now Enter your email to see the answer! By subscribing to TriviaTalent you are agreeing to our Privacy Policy and Terms of Use. See Results
