The Stamp Act was considered unfair by American colonists due to 'taxation without representation', leading to organized resistance.
The main reason American colonists considered the Stamp Act to be unfair was that it was an example of taxation without representation. The colonists were taxed by the British Parliament without being granted a voice or representation in that decision-making process. This went against their belief that no one should be taxed without their consent, leading to organized resistance against the Stamp Act.
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