To keep it simple, the Truman Doctrine was an anti-communist document. It basically said that the United States would help prevent the spread of communism.
Answer:
The scientific method.
Explanation: Hope this helps.
Warren G. Harding used the campaign slogan "back to normalcy"
Following this campaign, G Harding set up several conservative regulations that aimed to seclude United States from foreign relations in order to maintain 'neutrality'. One of his most popular regulation is setting up higher tariff for foreign products to enter united states in order to protect local businesses.
