the answer to your first question is simple great britain wanted to benefit from trade to get richer and to sell the goods they got back to the colonies.
the reason the revolution war started was all because of trading. britain wanted to benefit from the trade to get more money but britain also didnt want the colonies trading with anyone but them. britain started to send troops into the colonies because they didnt want to have to fight a war and have to pay more money. britain also raised the taxes on imported goods and tea so that the colonist would have to pay more money.
