Question

What act set the tone for the westward expansion of the United States of America by establishing that new states would be formed
and admitted to the United States, instead of allowing existing states to expand their territory?

Answer 1

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Answer: The Coining of 'Manifest Destiny'

Explanation: The idea that the United States must inevitably expand westward all the way to the Pacific Ocean had taken firm hold among people from different regions, classes and political persuasions.