Why were the colonists so upset abput the new taxes?

The colonists were upset about the new taxes primarily because they were imposed by the British Parliament without their consent, leading to the rallying cry of "no taxation without representation." Many colonists believed it was unjust to be taxed by a government in which they had no elected representatives. Additionally, these taxes affected their daily lives and economic stability, fueling resentment towards British authority and ultimately contributing to the desire for independence.