Final answer:
Source 1 by Jacques Godechot focuses on social and ideological factors like demographic changes, the bourgeoisie, and Enlightenment ideas leading to the revolution, whereas Source 3 by Sylvia Neely attributes the cause primarily to the French government's financial crisis.
Step-by-step explanation:
One major difference between Source 1 and Source 3's interpretation of the causes of the French Revolution is that Source 1 highlights a combination of social factors and ideological influences, including demographic changes, the rise of the bourgeoisie, and the spread of Enlightenment ideas, while Source 3 emphasizes the financial crisis as the main trigger for the revolution.
Source 1's perspective, presented by Jacques Godechot, suggests that a variety of factors contributed to a robust national revolutionary impulse that led to the fall of the Old Regime. In contrast, Source 3, articulated by Sylvia Neely, points to the French government's inability to pay its debts as the singular initiating cause of the revolution.