US History: The Korean War

Description
In this discussion, please choose and respond to two of the prompts that follow. Topic prompts are generally comprised of several sub-questions, of which all must be addressed. Responses should be in original wording and contain a few images or videos to enhance the posting. The inclusion of researched information from supplemental resources is highly encouraged (cited in MLA format below your answers)..Please include your selected topic questions above your responses.
Topic 1: What were the reasons for the United States getting involved in the Korean War? Why was this considered a "police action" instead of a war for the United States? What were the outcomes of the war when a cease-fire agreement was signed in 1953, and how do they relate to Korean and U.S.-Korean relations today?
Topic 2: What were some global events in the five years following World War II that contributed to the development of a global Cold War? What were the two basic sides of the Cold War (nations, ideologies, economic systems, etc.)?
Topic 3: What were the basic premises of the three Truman-era Cold War policies: containment, the Marshall Plan, and the Truman Doctrine? How did they affect American influence and intervention over the next decade in Europe and Asia? What are some lingering effects of these policies today?
Topic 4: How did Eisenhower's "dynamic conservative" policies indicate a new direction for his Republican Party in the 1950s? How did Joseph McCarthy represent another side of the Republicans during this era? Which elements of both have endured over the decades and can be found with contemporary conservative ideology? (A rational, objective assessment should refrain from biased opinion, partisan media sources, and sweeping generalizations.)
Topic 5: What was the Red Scare, and what were some genuine events that sparked its development? Related, how were the McCarthy and HUAC hearings different and what were their similarities? What was "McCarthyism" in general, and how did McCarthy's power and influence ultimately come to an end?