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The correct answer is Isolationism
Becasue isolationism is where a country does not let anyone in or out of its borders and it does not participate in worldly afairs. It also has isolation in the name and the definition of isolation is the process or fact of isolating or being isolated.
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The Revenue Act of 1926, which was signed by President Coolidge, mainly had an effect on upper-class Americans, because it eliminated many inheritance and "gift" taxes.
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It seems to most likely be D) It offers an example of civil disobedience.
Answer:
Osama bin Laden and al-Qaeda planned and carried out the attacks on the United States.
The supreme courts decision was the most important act in the quest for equality and freedom, because it legally allowed more freedom.