Which factor did not play a part in the spanish conquest of the aztec and inca empire

"African slaves outnumbered the indigenous population by nearly 50 percent" was the one factor among the following choices given in the question that did not play a part in the Spanish conquest of the Inca and Aztec empires.

.

Explanation:

1. they could both use a veto to cancel an action.

2. women couldn't vote in the roman republic but could in the united states

-18 metres sorry if im wrong