A-they had many natural resoures
You didn’t put choices for what we can pick from, but as far as i can see, i would put Aztec Religion!
Explaining: If they feared the Aztec people then i would assume that they also fear their religious practice!
The states that had seceded, during the reconstruction engineered by Johnson were first supposed to sign papers stating that they would not secede again from the union. congress refused to sit also representative from these states until they complied with the reconstruction demands, and one by one they all complied.