0 In which century did the RMS Titanic sink? 18th Century 19th Century 20th Century 21st Century 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
