Carmichael was known as an Honorary Prime Minister to the Black Panther Party, a revolutionary self defense group. They fought back with violence, which opposed they views of King. They simply did not agree because King valued a nonviolent approach while Carmichael believed violence should be incited in defense
Westward expansion was a natural progression for the nation because the most powerful entities came from the East (England). It is only natural that they spread out and conquer/capture/kill/annihilate those in their way (the true Americans/Native Americans). In doing so they conquered a whole land and taught them their ways while spreading West.
If you mean the United States, the answer is non of the above.
If you mean the United States Citizens, the answer is A, B, and C.
The North was led by a communist regime under Kim ll Sung who was supported by the Soviets. The South was led by a nationalist Rhee who was supported by the U.S. Since both wanted to conquer the entire Korean Peninsula and both were aligned with different political ideologies, it wasn't too unreasonable that Kim decided to attack the South. As a result, America, who adopted a policy of containment under Truman, wanted to expel communist influence as much as possible, which led to America playing a role in mobilizing a UN force to support the South.