Final answer:
Dr. Martin Luther King Jr.'s last sermon was titled "I've Been to the Mountaintop," given in support of the Memphis sanitation workers and addressing broader civil rights issues, the day before his assassination.
Step-by-step explanation:
The name of Dr. Martin Luther King Jr.'s last sermon was "I've Been to the Mountaintop". Delivered on April 3, 1968, at the Mason Temple in Memphis, Tennessee, this speech supported the sanitation workers' strike and addressed the larger Civil Rights Movement.
King's powerful words resonated with the idea that dignity and equality were not merely a part of the struggle for a fair wage but were deeply entwined with the essence of what it means to be human—articulated by the workers' signs that read "I AM A MAN." King's speech also poignantly acknowledged the persistent threats to his life, yet he emphasized the importance of continuing the fight for justice. He famously concluded his speech with prophetic words about having seen the Promised Land, suggesting he might not be there with the people to witness its coming, which took on tragic significance when he was assassinated the following day.