The Declaration of Independence is significant because it declared America's independence from Great Britain, and that it would not remain a British colony. This action allowed America to develop as a nation rather than a colony, which eventually resulted in a democratic republic, a worldwide economy, and many social improvements.
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The answer for this question is D.
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I believe the answer is: universal across cultures
This mean that the stages of development that proposed by piaget could also be spotted in other society that had different custom/cultures than united states. From this, we can infer that the development is influenced by biological factors rather than environmental.
D increasing migration to the United States
