- 
  
  Principle of the U.S. policy by James Monroe in 1823 that any intervention by any external powers in the politics of the Americas is a potentially hostile act against the U.S.
 - 
  
  
 - 
  
  Purchase of Alaska to expand the U.S. for potential resources
 - 
  
  William Mckinley increased tariffs on manufctured goods to as high as 49%.
 - 
  
  boundary dispute between Venezuela and great Britain ended bringing Britain and the United States to the brink of war.
 - 
  
  A war between Spain and the U.S. following the sinking of the American Battleship Maine in the Havana harbor on February 15, 1898
 - 
  
  Hawaii was initially reconstituted as an independent republic, but the goal was annexation of Hawaii to the U.S.
 - 
  
  This ended the Spanish-American War and made Cuba a independent country and later became a U.S. protectorate and Puerto Rico became a U.S. protectorate and other countries got free from Spain.
 - 
  
  This added the Philippines as a US territory. This provided more resources for the economy and helped with trade.
 - 
  
  The U.S. used it's financial power to extend international influence.