Question

The threat of communist take over of Greece and Turkey led the United states to

Answer 1

The threat of communist take over of Greece and Turkey led the United states to pass the Truman Doctrine. The Truman Doctrine was passed on March 12th 1947, by President Truman.

Answer 2

In Greece, the US supported the anti-communist side of the Greek Civil War after WW2, and in Turkey the US supplied abundant money and resources to the country in order to make communism seem less appealing.
Hope that I helped!