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  The acquisition of Louisiana territory from France, which doubled the size of the U.S. and provided economic opportunities through land and resources.
Category: Political/ Economic - 
  
  Legislation passed to maintain the balance of power between slave and free states. Category : Political
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  A slave rebellion that caused widespread fear among slaveholders and led to harsher laws against slaves.
Category: Social - 
  
  A confrontation between South Carolina and the federal government over tariff laws, highlighting tensions between state and federal powers.
Category: Political/Economic - 
  
  
The incorporation of Texas into the United States, which sparked debates over the expansion of slavery.
Category: Political - 
  
  Conflict resulting in U.S. acquiring territories in the southwest, fueling further expansion and economic growth.
Category: Political/Economic - 
  
  A set of laws attempting to give something to both free and slave states, including the Fugitive Slave Act.
Category: Political - 
  
  Tubman's efforts in leading slaves to freedom challenged the institution of slavery.
Category: Social - 
  
  _Allowed new territories to decide on slavery through popular sovereignty, leading to violent conflict known as "Bleeding Kansas." _
Category: Political - 
  
  Supreme Court ruling stating that African Americans were not citizens and had no rights, further polarizing the nation.
Category: Political - 
  
  An attempted insurrection by abolitionist John Brown to incite a slave rebellion, heightening tensions between North and South.
Category: Social/Political - 
  
  Lincoln’s election prompted Southern states to secede, leading to the Civil War.
Category: Political - 
  
  Following Lincoln's election, several Southern states seceded from the Union, leading to the formation of the Confederacy and the Civil War.
Category: Political