Answer:
The main problem was because they didn't have their representatives in the Parliament and therefore weren't able to participate in the process of decision making. For example, when new taxes and acts were introduced, colonists weren't able to participate in discussions, especially because they were the ones that were paying most of the taxes.
Explanation:
Colonists felt that they were deprived of their rights and that British government is doing nothing to help them.
To make things worse government introduced new laws, which were against the interest of colonists.
As the colonists didn't have anyone to represent them in London they couldn't legally change anything. That is why revolution started.
