Final answer:
Document A: Articles of Confederation, Document B: U.S. Constitution.
Step-by-step explanation:
The correct identification for Document A and Document B is:
Document A: Articles of Confederation
Document B: U.S. Constitution
The Articles of Confederation was the first governing document of the United States, which was in effect from 1781 to 1789. It established a weak central government with limited powers. The U.S. Constitution, on the other hand, replaced the Articles of Confederation and created a stronger federal government with a system of checks and balances.