Which finally abolished slavery in the us?

The Thirteen Amendment to the Constitution finally abolished slavery in the United States.

Explanation:

The Thirteenth Amendment to the United States Constitution officially abolished and continues to prohibit slavery in the United States of America, and, with limited exceptions (such as those condemned for a crime) prohibited involuntary servitude.  

At the time of its ratification, slavery remained legal only in Delaware, Kentucky, Missouri, Maryland and New Jersey. In the rest of the United States the slaves had been freed by the state action and the "Emancipation Proclamation" of the federal government.

Abraham Lincoln (who had promulgated the Proclamation) and others were concerned that the Emancipation Proclamation would be seen as a temporary measure only during the Civil War, and, therefore, in addition to the liberation of slaves in those states where slavery was still legal, they supported the Amendment as a means of guaranteeing the permanent abolition of slavery.

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explanation:

answer: ensure protection from communism

explanation:

the north atlantic treaty was largely dormant until the korean war initiated the establishment of nato to implement it, by means of an integrated military structure: this included the formation of supreme headquarters allied powers europe in 1951, which adopted the western union's military structures and plans.