Why were taxes implemented in the colonies?

Taxes were implemented in the British colonies of North America to help pay for the various wars the Empire was engaged in. Since the American colonies were among the wealthiest in the British Empire it made sense to Parliment to tax them to help pay the bills for the defense of the British Empire. The problem with this was that the colonies had often times had to defend themselves against Native Americans, the French and Spanish. It made little sense to Americans for them to have to pay to once to defend themselves and then pay again to defend an entire empire.