Final answer:
The theme of Martin Luther King Jr.'s 'I Have a Dream' speech primarily serves to teach us something.
Step-by-step explanation:
The theme of Martin Luther King Jr.'s 'I Have a Dream' speech primarily serves to teach us something. In his speech, King addresses the issue of racial injustice in the United States and shares his vision for a harmonious, integrated society. Through his powerful words and passionate delivery, he inspires listeners to take action and work towards achieving equality for all.