What is the effect of old majors speech in animal farm?

Old Major's speech in "Animal Farm" serves as a powerful catalyst for the animals' rebellion against human oppression. It inspires them to envision a society where they can live freely and equitably, free from exploitation. His ideas of solidarity and the critique of human tyranny galvanize the animals, fostering a sense of unity and purpose that ultimately drives them to overthrow their human farmer. The speech lays the ideological foundation for the subsequent events in the story, highlighting themes of revolution and the pursuit of an ideal society.