Because they can build something for everyone not just help poor lazy people this benifits everyone in stead of a single group of people
After fighting the war in Korea, the US had learned that communism would spread. In order to keep with their policy of containment, they had to rush in and stop Viet Cong from spreading communism (much like the domino theory that the US had). Had Viet Cong not wanted to bring about communism, there would be no need for invasion, and the domino theory would have yet to be proven.
:)
<span>One of the best known covert actions of the Central Intelligence Agency (CIA) was its role in the 1953 overthrow of the Iranian government headed by Mohammed Mossadegh and the subsequent installation of the Shah in to power. While it is true that the coup was successful in large part due to CIA money, materials and strategy, it is also true that the CIA did not act alone.</span>
I assume you mean the Golden Islamic time from 8th to 13th century!
During this time, Islamic scholars were among the world's best. Among others they:
made achievements in maths (which is why algebra and algorithm are arabic words)
worked on scientific experiment as a technique to pursue knowledw
had some advancements in astrophysics (first reference to Andromeda Galaxy!
had a lot of advances in medicine, such as study of blood circulation, and of nervous system