A desert is an area that receives very little precipitation - c.
Deserts are mostly areas with sand, as is popularly considered, but it's not only sand that is problematic, it is also the fact that these areas receive very little precipitation (rain) which poses more of a problem.
Answer:
The Truman Doctrine was an American foreign policy whose stated purpose was to counter Soviet geopolitical expansion during the Cold War. It was announced to Congress by President Harry S. Truman on March 12, 1947, and further developed on July 12, 1948, when he pledged to contain threats to Greece and Turkey.
Populism is a political party who believes all people should be unified as one. They support the rights of the people.