Final answer:
Drysdale claims that the antique table has historical significance because it was part of the Declaration of Independence, symbolizing American ideals and historical events, including the significance of Queen Anne's War marked by the conquest of Acadia.
Step-by-step explanation:
The historical significance Drysdale claims for the antique table is that it was part of the Declaration of Independence. An analysis of Figure 9.20.2, which details the leg of the table in the Lansdowne Portrait, suggests that the table and the objects on it symbolize American Ideals and historical events. Additionally, in reference to Queen Anne's War, the war's historical significance is marked by the conquest of Acadia, which brought a significant territory under English control.