Why did the two groups fight in the american revolution

By 1774, the year leading up to the Revolutionary War, trouble was brewing in America. Parliament (England's Congress) had been passing laws placing taxes on the colonists in America. There had been the Sugar Act in 1764, the Stamp Act the following year, and a variety of other laws that were meant to get money from the colonists for Great Britain. The colonists did not like these laws.
Great Britain was passing these laws because of the French and Indian War, which had ended in 1763. That war, which had been fought in North America, left Great Britain with a huge debt that had to be paid. Parliament said it had fought the long and costly war to protect its American subjects from the powerful French in Canada. Parliament said it was right to tax the American colonists to help pay the bills for the war
Most Americans disagreed. They believed that England had fought the expensive war mostly to strengthen its empire and increase its wealth, not to benefit its American subjects. Also, Parliament was elected by people living in England, and the colonists felt that lawmakers living in England could not understand the colonists' needs. The colonists felt that since they did not take part in voting for members of Parliament in England they were not represented in Parliament. So Parliament did not have the right to take their money by imposing taxes. "No taxation without representation" became the American rallying cry.