I want to know the answer to the following question:
At its zenith, the imperialist forces controlled all but how many states in Mexico?
All the background I'm provided with is that "At the zenith of their power, the imperialist forces controlled all but four states in Mexico; the only states to maintain strong opposition to the French were: Guerrero, Chihuahua, Sonora, and Baja California.". Is that enough to answer the question?