Interesting question!
It is a huge misconception that there were no slaves in the north. Slavery was not as common due to the fact that the Northern economy was not as heavily agricultural as in the South. New York and Connecticut had large slave populations. <span> In the North they have cold winters and the South had mild winters. Meaning you would have to provide warmer cloths, food and warmer shelter which would cost slave owners in the North more money</span>
Cortes showed up, the Aztecs welcomed him with open arms. They apparently thought he was a god. They gave him all the gold he could ever want, but he decided that that wasn't good enough and so he set up a meeting with Montezuma (their leader). He then captured Montezuma. The Aztecs realized their mistake and beat the Spanish back.
<span>After a while, the Spanish enlisted the aid of oppressed tribes living under Aztec rule, and when they made a move on the Empire, they found most of the Aztec warriors dead or dying of diseases that THEY brought over from Europe. They then conquered everyone.</span>
Answer: A massive migration west
Explanation: