1. The Proclamation of 1763 cut off settlement of the new lands gained from France. This greatly angered colonists who hoped to get cheap/free land out west. Also, any rich land speculators would lobby for some type opening of this land.
2. Historians estimate 1/3 of the colonists in the 1700s to be Patriots desiring independence, 1/3 to be Loyalists who were OK with the taxation, and 1/3 were apathetic to the cause or simply uninformed. The Patriots were in a minority.
3. The Patriot cause in Boston (the centre of the movement for the most part) was driven by John Hancock, a smuggler who hated British taxes and searches of his property and by Samuel Adams, a former tax collector whose father's finances had been ruined by British officials.
4. Southern Plantation owners were in massive debt to England. They felt if independence occurred their debts would no longer be owed which would save them millions.