Final answer:
The main purpose of Morelos' speech was to celebrate the moment of unity among the Mexican people in their fight for independence from Spanish tyranny and fanaticism.
Step-by-step explanation:
The main purpose of Morelos' speech was to celebrate the moment of unity among the Mexican people in their fight for independence from Spanish tyranny and fanaticism. Morelos compares this moment to the past when Aztec heroes like Moctezuma and Cuauhtemoc were slaughtered by the Spanish conquistadors. The speech is a call to avenge the crimes committed against their ancestors and to free themselves from the chains of serfdom and oppression.