The unique aspect of US Constitution is the separation of powers and the system of checks and balances.
Explanation:
As per the mandates of the American constitution, each division of the government administration is permitted to enforce a set of powers and responsibilities. These powers are limited for all the sections of the government and this classification of commands ensures each branch to act in an independent manner but it is also superintended and regulated by the other branches of the government.
For example, Executive can provide authorization and pass laws in the parliament and a new law can be affected but at the same time it should not generate decrees which express it to be authoritative.
The answer to your question is B
Germany, Italy, Japan
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C. Debt owed to the United Nations.
As the sponsor of Christopher Columbus's voyages, Spain was the first European power to settle and colonize the largest areas, from North America and the Caribbean to the southern tip of South America.
