Without giving us the passage you have in front of you, maybe you can figure it out on your own (or perhaps already did). Which of the themes is evident in the passage you're looking at?
The rise of McCarthyism: Senator Joseph McCarthy led a vigorous campaign to root out all persons that had any suspicion of being communist sympathizers.
The elimination of the House Un-American Activities Committee: That was part of the backlash against McCarthyism, seeing that McCarthy and others had gone to far in their anti-communism crusade.
Opposition to Republicans supporting the Korean War: Though Truman's actions to get involve the United States in the war in Korean were initially popular, that popularity began to dwindle once China entered into the conflict and it became apparent this was going to be a protracted and difficult struggle.
The Truman Doctrine was first stated by the president to Congress in 1947, saying: "I<span>t must be the policy of the United States to support free people who are resisting attempted subjugation by armed minorities or by outside pressures." Essentially, the Truman Doctrine pledged American effort elsewhere in the world to check the spread of communist and Soviet influence. The policy was first put into action in 1948 by providing economic support to Greece and Turkey to stave off communist movement in those countries.</span>
Belive It's D. sorry If Its Not. Good Luck :)
Mostly because our modern civilizations were born there. "The region saw the development of some of the earliest human civilizations,
which flourished thanks to the water supplies and agricultural
resources available in the Fertile Crescent. Technological advances made
in the region include the development of writing, glass, the wheel, agriculture, and the use of irrigation." ~Wikipedia
The main factor was the utilization of raised field agriculture. They would build these fields that had been artificially raised to a certain height along a flowing water source (mostly rivers but occasionally streams as well in some cases). When tropical weather patterns would cause said water sources to flood, instead of washing away the crops, it would act as irrigation for the raised fields. Securing a steady food source allowed the Mayans to support a large civilization in the tropical regions they called home.
Martin Luther King as a preacher, pastor and civil rights leader during the Civil Rights movement in The United States during the sixties.