Answer:
The Domino Theory was based on the idea that communism was a contagious force that spread from country to country. It was first advanced during Harry S. Truman's presidency, when WW2 ended, as the United States adopted the policy of Containment to restrict communist expansion and the sphere of influence held by the USSR.
The answer for this is "Compromise of 1850".
The Compromise of 1850 is a set of laws dealing with the issue of slavery. California was admitted as a free state, upsetting the groups in favor of slavery and satisfying those opposing it in the U.S senate. In Addition, California abolished the slave trade by entering the Union as a free (no slavery) state.
Between the time periods of 600-1450 Common Era, it was
referred to as the dark ages in Europe because the cities and regions in Europe
lack poetry, which was a dark experience. It was not really a dark globally,
but only in the part of Europe wherein poetry vanished, but right after the
dark ages, was the beginning of the modern age, which gave life to poetry and
to music once more.
The answer should be A) .