The purpose of the Jim Crow laws was to segregate and disenfranchise black Americans. The Jim Crow system, which was a racial caste class in actuality, was a series of immutable anti-black laws that mainly deprived African Americans the right to suffrage.
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The rebellion affirmed the need for a stronger federal government, and eventually led to the creation and ratification of the US Constitution and The Bill of Rights
The name of the military alliance formed to counter the Soviet expansion was the North Atlantic Treaty Organization. NATO provided a strong military alliance to counter the Soviet Unions expansion. Approximately twelve Western European and North American nations agreed to act together in the defense of Western Europe, such as France and Italy.
The third one is the answer