The preamble to the Declaration of Independence establishes the philosophical and political underpinning to the new nation's decision to sever its ties to Great Britain. In the preamble, Jefferson calls on Enlightenment philosophy to explain why the new country is justified in breaking away from Great Britain.
 
        
             
        
        
        
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The Indian Removal Act was signed into law by President Andrew Jackson on May 28, 1830, authorizing the president to grant unsettled lands west of the Mississippi in exchange for Indian lands within existing state borders. 
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