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>
The Petition of Right was made to restate the legitimacy of the Magna Carta. Parliament used it because the King had been going against Magna Carta by gathering forced loans.