Answer:
all of the above is the answer
The American colonies of 1760, did many Americans consider themselves British? Did they consider themselves Englishmen, even if born in the colonies? Also, am I right in the impression that a resident of Massachusetts would be the least likely to identify as British? That they were the most independent minded, even in 1760?
The three things that brought about the fall of Rome when they all hit at once are:
1. multiple civil wars
2. economic collapse due to inflation
3. repeated invasions from all over
Rome used to be the most powerful country that ruled most of the world, but over time, its strength started to wane. In the end, due to many reasons, such as these above, it was forgotten and gave way to new countries being created.