Why did britain begin to heavily tax the colonies? king george iii was greedy. king george iii wanted to seem powerful and impose taxes on the colonists. to pay for the french and indian war. to pay for protection against the native americans.

Britain began to heavily tax the colonies to help pay for the French and Indian War. 
They lost a lot of money during those wars, so they had to find a way to repay their numerous debts. This is why they decided to raise taxes that the colonists had to pay.

Require the nobles and clergy to pay taxes.