Final answer:
Truman believed the US should provide military aid to Greece and Turkey in the British crisis, and he convinced the American people through a speech. This led to the creation of the Truman Doctrine.
Step-by-step explanation:
Truman's perspective on the British crisis was that the United States should take Britain's place in the Mediterranean region by providing military aid to the monarchies of Greece and Turkey. He recognized that the US history of isolationism and hostility to monarchy could be an obstacle, so he addressed the American people in a speech to convince them that the US must intervene against Communist forces. This led to the establishment of the Truman Doctrine, which aimed to support free peoples resisting subjugation by armed minorities or outside pressures.