If there's one law that governs both foreign policy and real estate, it's location, location, location. Invest your hard-earned $$$ in property that seems like it's going to go up in value (so, like, not near a toxic waste dump) and invest your government aid in countries that are strategically important.
Harry S Truman gave a speech in 1947 describing a new approach in foreign policy that said the U.S. would provide government aid to countries resisting communist takeovers. Greece and Turkey were the two politically unstable countries Truman wanted to help first, and they got a lot of airtime during the speech because their locations were important for maintaining peace—a.k.a. Western control—in the Middle East.
Truman wanted to extend his policy to any country fighting or dealing with the Big Bad Communist Threat and believed that we were living in an era in which countries would have to choose between two ways of life: totalitarian control and communism or freedom and democracy.
In the Truman Doctrine, the U.S. finally squared up with the Soviet Union and Truman decided it was time for the U.S. to start blowing down the Soviet Union's houses before they blew down ours.
"The Truman Doctrine" was a big deal because it changed the tone and direction of U.S. foreign policy from one of avoiding permanent, entangling alliances to a strategy that emphasized allying with and providing aid to foreign countries.
Thanks to "the Truman Doctrine" and its emphasis on engaging in worldly affairs, the Cold War became "hot."
The minute World War II ended, the Soviet Union stopped playing nice and took control of several Eastern European countries. By 1947, Soviet expansion had gotten way out of hand, the British were pulling troops and supplies from the Middle East, and the U.S. needed a revised direction in foreign policy to assert its global position in a new Cold War.
Truman makes the case for his foreign policy recommendation by describing the civil war between communist and anti-communist factions in Greece. Then he describes the developing threat of a communist insurgency in Turkey. If just one of these countries is lost to communism, he says, then other countries in the Middle East will follow (like a line of dominoes) until the entire region is donezo. This will affect the West just as much as it will affect the East, and seriously might happen, considering the British are about to dip from the Middle East.
Along the way, Truman takes some jabs at the Soviet Union (without ever mentioning them by name), brings up WWII, and uses a lot of patriotic and democratic language to suggest that it is up to the U.S. to save both itself and the rest of the world from the Soviet threat.
The speech ends with an official declaration of foreign policy that says the U.S. will provide military and economic support to countries fighting totalitarian—a.k.a. communist—forces. Oh, and he says that we need to get on all of this ASAP.
Harry S Truman, one of our sassiest presidents to date, took the U.S.'s stance against communism from "not in my house" to "not in anyone's house."