The Seven Years' War (French and Indian War) was a huge turning point in the history of British colonial America by making Great Britain more involved in the affairs of the colonists.
Before the French and Indian War, Great Britain practiced salutary neglect with the colonies. This was where they essentially left them alone and did not become involved with their affairs and what they were doing. After the French and Indian War, they stopped practicing salutary neglect and became very involved with the colonists.
The colonists already hated that Great Britain was becoming more involved with them, but they mostly hated the taxes that were being put on them. They would argue that the taxing was completely unfair, as they had nobody to represent them in the British Parliament, also known as "taxation without representation."
On the other hand, Great Britain argued that the taxing was completely fair. The French and Indian War was very expensive and it was fought on the soil of the colonists, which Great Britain believed they should help pay for the debt. Along with this, Great Britain was stationing their troops to protect the colonists from Native American attacks. Since they were doing so much for the colonists, they did not think it was unfair to tax them.