Final answer:
The American eagle on the FFA emblem represents the national scope of the organization, symbolizing its widespread reach across the United States. The eagle is a symbol of the United States and its authority, and it signifies the national reach and influence of the FFA organization. It represents the FFA's commitment to promoting agricultural education and leadership throughout the country.
Step-by-step explanation:
The part of the FFA emblem that represents the national scope is the emblem’s use of the American eagle. This national symbol signifies the broad reach of the organization across the entire United States. The eagle emblematically reflects similar uses in other national symbols, indicating the organization’s connection to national pride and unity.