why does The national government makes all laws for its citizens?

The national government makes all laws for its citizens because it has the authority and power to do so. The national government is responsible for governing the entire country and ensuring the well-being and safety of its citizens. By making laws at the national level, the government can establish a consistent legal framework that applies to all individuals within its jurisdiction. This helps to maintain order, protect individual rights, and promote the common good of the nation as a whole. Additionally, having a centralized system of lawmaking ensures that there is uniformity and coherence in the legal system, which can help prevent confusion and conflict between different regions or states.