Cause of the Boston Tea Party, 1773

They were rebelling against the Boston Port Act.  America felt they were being taxed for the French and Indian War, which wasn't fair in their opinion. There were also issues America found with Parliament.

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The American colonists were incredibly angry at the British's "taxation without representation (in the British parliamentary system)" and since tea was one of the most highly taxed items at the time, the colonists viewed the large importation of tea from the British East India Company in the Boston harbor on December 16th, 1773, as an opportunity to make a political statement.

Explanation:

b) the confederacy had to pay all union war expenses.