Final answer:
The excerpt would be most useful to historians analyzing The Records of the Federal Convention of 1787, providing insights into the debates and decisions made during the Constitutional Convention.
Step-by-step explanation:
The excerpt quoted above would be most useful to historians analyzing The Records of the Federal Convention of 1787. The Records of the Federal Convention of 1787 refer to the collection of James Madison's letters and notes about the proceedings in Philadelphia, which provide invaluable insights into the debates and decision-making process during the Constitutional Convention. These records are crucial for understanding the historical context, motivations, and arguments of the delegates who gathered to create the United States Constitution. Historians can use these records to gain a deeper understanding of the debates surrounding the structure of government, representation, the power of the national government, and other key issues discussed during the convention.