Because an extremely limited central government. As the Confederation Congress attempted to govern the continually growing American states ,delegates found that the limitations placed upon the central government rendered it ineffective at doing so.
The answer is D, it became weak and vulnerable. It is proven correct of how the western Roman empire got conquered by barbarians soon afterward.
To build a much stronger resistance. A group have a more forceful voice.
Answer:
Correct The U.S government is a system.