How worried was Cortés
about his actual authority to act in Mexico?

Cortes was not worried at all about his authority to act in Mexico. He was given free reign in Mexico by the Spain crown, and he used its authority to justify all sort of measures in order to acquire and maintain control over the territories that were recent discovered. Cortes is still remember as one of the worst spanish conquistadores, because of its reputation and acts with the local people.

the answer is: the sesquicentennial of the american civil war is an occasion to consider the legacy of that great conflict. this legacy is our inheritance, and despite many indelible features, we continue to negotiate the resolution of that conflict. the civil war was fought over slavery, but not always on behalf of slaves

b) they want the land taken away from the wealthy landowners and given to peasants.