Many reasons, but a big one is "taxation without representation." Because America was so far away from Great Britain, the American colonies couldn't represent themselves when Great Britain was making laws. This was very frustrating for the people in America. They were getting laws from a king that didn't know anything about where they were living! The distance also meant people in America were very ISOLATED - they didn't have other British people around them, and it took a LONG TIME for other British people to come visit them. This made them feel on their own, and less like subjects to the British crown. Imagine Great Britain is like the dad. The other colonies like Egypt were children still living at home, because they were still close to Great Britain. America was so far away, it was like a child who had traveled to college. Great Britain Dad was telling College Student America when to go to bed or what food to eat! But College Student America was ready to take care of itself so it rebelled.

The reason more British colonies did not rebel was that Parliament took a more conciliatory approach towards the others following the American rebellion.

The population of the other colonies didn't consist primarily of the Europians, who came to the New World in search of freedom. Many of them were very educated people. They didn't consider the Britans godlike as the Indians, for instance. Besides most of the first Americans were protestants, who tried to build a city of God on Earth. For that they relied mostly on economy, on capitalism. Earning money was the way to gain happiness, from their viewpoint. The Britans happened to be on the way to haven because they weren't interested in the economic development of their colonies. England needed resources, nothing else. The colonies should support its own economic prosperity. So the interests clashed. The subjects thought themselves equal to their rulers. That's one of the points where revolution starts. Well, it's the matter of consciousness. Simply speaking, the American colonists had much higher self-esteem, than the inhabitants of the other British colonies.

There is a saying, "Might makes right".