what system of government gives all key powers to the national government.

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The system of government that gives all key powers to the national government is known as a unitary system. In a unitary system of government, the central or national government holds the ultimate authority and exercises power over all subordinate levels of government, such as regional or local governments. This means that decisions regarding policy-making, legislation, and governance are typically made at the national level, with limited or no powers being delegated to lower tiers of government.

To find this answer:

1. Start by understanding the different systems of government. Familiarize yourself with concepts such as unitary, federal, and confederal systems.

2. Research the characteristics and features of a unitary system of government. Look for information that explains how power is distributed and where the ultimate authority lies.

3. Compare the powers of the national government with those of lower levels of government in different systems. Identify the system in which the national government has the most significant control over key powers.

4. Analyze and evaluate various examples of government systems to identify which one aligns with the description of giving all key powers to the national government.

Remember, it's always important to consider different sources, such as political science textbooks, reputable websites, and scholarly articles, to ensure accurate and comprehensive information.