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develop a timeline for the american revolution.
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1775:
  - the battles of lexington and concord
  - the siege of boston
  - the battle of bunker hill
  - the colonists successfully capture fort ticonderoga

1776:
  - thomas paine publishes common sense
  - the colonists sign the declaration of independence
  - the battle of long island
  - the battle of trenton

1777: 
  - the battle of brandywine creek
  - the battle of germantown
  - the battle of saratoga

1778:
  - the battle of monmouth

1781:
  - the siege of yorktown

1783:
  - the treaty of paris
  - the united states officially becomes an independent nation
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