Why did tea destined for New York and Philadelphia return to England?

Tea was returned to England by the Boston Party because the colonists were protesting the Tea Act of 1773. The Tea Act gave the British East India Company a monopoly on the sale of tea in the American colonies, and it also imposed a tax on tea. This angered the colonists, who felt that they were being taxed without their consent. In response, they organized the Boston Tea Party, which was a protest against the Tea Act. During the Boston Tea Party, colonists boarded three ships that were carrying tea and dumped the tea into the Boston Harbor.