Final answer:
Paul McCartney's song 'Blackbird' is a commentary on the civil rights movement of the 1960s, emphasizing the period's social unrest and the struggle for African American equality.
Step-by-step explanation:
Paul McCartney's "Blackbird" was a subtle commentary on the civil rights movement during the 1960s in America. This period was characterized by considerable social unrest, with actions and events such as race riots, civil rights rallies, and the assassinations of influential leaders like Martin Luther King Jr. and Robert Kennedy, who worked to combat poverty and injustice. McCartney's song reflects on the struggle for African American civil rights, using the metaphor of a blackbird taking flight to signify the fight for freedom and equality.