The Boston Tea Party was a response by colonists in Boston against the British government and the monopolistic East India Company. The colonists refused to return three shiploads of taxed tea to Britain and instead threw it into the Boston Harbor. For more information, visit http://en.wikipedia.org/wiki/Boston_Tea_Party.
The American colonists were tired of Britain's laws and taxes. They were gradually growing closer to the American Revolution, and the tensions were building, and some of the colonists thought that throwing the tea overboard in the Boston harbor would make Britain back off....but it only made things worse.