A reason why the Civil War lasted four years is that the Union had to fully conquer the South.
The correct answer to this open question is the following.
Unfortunately, you did not attach the options for this question. Without the options, we do not what was not an advantage held by the Spaniards over the Native Mesoamerican people.
So the only thing that we can do for you is to answer based on our knowledge of this topic regarding the advantages that the Spaniards indeed had over the indigenous people.
The Spanish conquistadors had metal weapons, fire weapons, armors, and horses, that represented major advantages against the primitive weapons of civilizations such as the Aztecs.
Let's have in mind that in Mesoamerica there were no horses. It was the Europeans who brought horses to America. Natives such as the Aztecas have never seen a horse and they compare it to something similar they had seen before, a deer. Horses for the Spaniards represented an advantage in the purposes of conquest because horses can carry a heavy load and were used in battle.
And regarding fire weapons, native Indians could not compete against that powerful weapon.
