That would be the populist party
On this problem you don't need to subtract. They want to know the total amount of people who attended so you would add.
1 1 1 (carried over numbers)
12,679 (Line it up with 8491, ones place to ones place and so on)
+8,491
21170 (answer)
<span>These subordinate people were ready to rebel when the Europeans arrived, because they felt like they may finally have a chance. The Europeans brought superior fire power, and posed a legitimate threat to the Aztec Civilization.</span>