Answer:
C. Free and slave states had about equal power before the Louisiana Purchase. After, new states would be added that might change the balance.
Step-by-step explanation:
The Louisiana Purchase, which was completed in 1803, was the acquisition of the territory of Louisiana by the United States from France. The vast territory, which included parts of what are now 15 U.S. states, doubled the size of the United States and opened up new land for settlement and trade. One of the concerns raised by the Louisiana Purchase was how it would affect the balance of power between free states and slave states in the United States. C. is the correct option because it explains that the balance of power between free and slave states was already delicate and the addition of new states might change the balance.